The Colour of Drones

‘Is that what those colours mean?’
‘I don’t think so.’
‘That’s just grey, isn’t it?’
‘I think technically it’s gunmetal.’
‘And is that magenta?’
‘More violet. […]’

/Look to Windward, p.211

It is my intention to analyze these colours somewhat further (this because I have actually thought of creating a colour-based ‘body language‘ myself—this is one of the main reasons for me reading Banks today at all. When I spoke of ‘my’ language with a friend of mine [Thomas Gylfe] he said it reminded him of Iain Banks drones. And I just had to read something.—And so I started with Use of Weapons and ended up getting caught…)

/by zrajm,
created 1 March 1999,
last update 16 February 2026

Contents

NOTE: This article needs some more work. Even though references was updated on 16 February 2026, the summarizing tables below were not adjusted to reflect the new data.

By Spectrum

The below text does not attempt to analyze the motion of the colors, but it looks like that certain verbs (and adjectives!) are used more in combination with certain colors. ‘Flashed’ is frequently used with white (anger), grey (frustration) and rainbow (surprise/confusion), while ‘glow’ is used with red (pleasure) and pink (amusement). Among adjectives ‘frosty’ is often used for blue (and once for grey).—Also, does ‘rainbow’ and ‘rainbowed’ entail a movement of color, or is it a static thing?

Red · Orange · Yellow · Green · Blue · Indigo · Violet

Another Table

I made a little table of the colours occuring above, in the attempt to see if there’s a system to it. Down the middle you’ll find the colours of the rainbow, with darker versions on the left, and brighter versions on the right. I’ve separated the line of “brow / muddy cream / lurid orange” from “orange”, mostly based on the emotions the colour depict, it doesn’t seem to fit very well as-is either.

If anyone could suggest improvements, I would be happy to implement them.

One thing that is not easy to indicate in the table below is brightness. Presumably there’s nothing stopping a Banksiain drone from shining brightly to illuminate a whole room (for the most intense white anger or lurid orange distress).

^* The reference to “blue-grey” might not actually refer to one color, but could, as far as I understand, equally well be ment to refer to a pattern with of blue and grey parts.

How colours affect emotion might also be interesting reading.

Is a Better Understanding Possible?

As you might have noticed, humans show emotions too: Somewhat akin to the body langugage of colour which Iain M. Banks’ drones display. I just figured it would be kinda interesting to compare the two phenomena, and maybe see if theres a 1:1 mapping of the two, in some subtle, yet intelligent way. …but… I haven’t gotten around to doing that comparison in full—yet.

As some sort of preliminary though—here is a picture of “The Six Basic Facial Expressions” (proposed by Ekman [1992]) which might work as a sort of map over the cardinals of human emotional expressions.

Maybe it’s possible to map the colours of drones onto an “emotion wheel” to help understand the drone colour language more in-depth? Here’s an emotion wheel (as described in one of these “Theories of Emotions”) and a simple colour wheel compared:

They are not all that different, are they?

MIT have created a robot (head) called Kismet which displays emotion using facial expressions. However they felt it necessary to add arousal states (either “bored”, “interested”, or “calm”) to the above mix, resulting the following space of possible emotions:

The state describing Kismet’s mood consists of one point in this space, and as its mood changes, the face changes expression to reflect this. Just like the colours of a drone, or the expression on your face. Only, it can’t lie, of course (it most notably can’t lie badly, or in any other way display several conflicting emotions at once).

References

Consider Phlebas (1987)

FIXME: This book has not yet been searched for drone color references using method outlined in Appendix. /16 February 2026

• Page ? (rosy → amused): The screen displaying what the scout missile could see showed a tree a hundred meters behind the last, trundling wagon. The tree jerked and the top three-quarters slid at a steep angle down the sloped stump that was the bottom quarter before toppling to the dust. “That took a flick,” the drone said, glowing briefly rosy again and sounding amused. The wagons and siege engines filled the view coming from the knife missile. “The first bit’s actually the trickiest …”

The Player of Games (1988)

NOTE: This book has been searched for drone color references using method outlined in Appendix. Edition used here makes use of American spelling (‘gray’, ‘color’ etc). /15 February 2026

• Page 9 (gray, brown, blue → formal): “He turned to face the small drone which had floated up to him as he re-entered the richly furnished hall. People stood talking, or clustered around game-boards and tables beneath the great banners of ancient tapestries. There were dozens of drones in the room too, some playing, some watching, some talking to humans, a few in the formal, lattice-like arrangements which meant they were communicating by transceiver. Mawhrin-Skel, the drone which had addressed him, was by far the smallest of the machines present; it could have sat comfortably on a pair of hands. Its aura field held shifting hints of gray and brown within the band of formal blue. It looked like a model of an intricate and old-fashioned spacecraft.”
• Page 10 (red → humorous pleasure, brown → displeasure): “Gurgeh sensed the people around him grow a little quieter. Mawhrin-Skel’s aura fields switched to a mixture of red and brown; humorous pleasure, and displeasure, together; a contrary signal close to a direct insult.”
• Page ? (red): “Gurgeh sensed ‘Cheap trick,’ Mawhrin-Skel said, for all to hear. ‘The kid was easy meat. You’re losing your touch.’ Its field flashed bright red, and it bounced through the air, over people’s heads and away.”
• Page ? (yellow): ‘“Allow me,’ Chamlis Amalk-ney murmured, gently taking the glass from his hand and placing it on a passing tray a good three meters away. Its yellow-tinged field brought back a full glass of the same rich wine. Gurgeh accepted it.”
• Page 12 (gray-white → displeased): “Chamlis’s aura flickered a displeased gray-white. It set the glass down noisily on the table and threw the savory into a distant bin. ‘It’s that dreadful machine Mawhrin-Skel,’ Chamlis said testily.”
• Page 13 (orange → well-being, purple → contrition): “‘You are a mischievous and contrary device,’ Boruelal said to the drone Mawhrin-Skel, floating at her shoulder, its aura field orange with well-being, but circled with little purple motes of unconvincing contrition.”
• Page 13 (blue → formal, brown → ill-humor): “‘Anatomy lesson,’ it said, its fields collapsing to a mixture of formal blue and brown ill-humor.”
• Page 15 (white → anger, bright rippling spot of rainbow light → tight-beam communication): “‘Meatbrain,’ Mawhrin-Skel told Chamlis Amalk-ney, and zoomed off toward the line of open windows. The older drone’s aura field flashed white with anger and a bright, rippling spot of rainbow light revealed that it was using its tight-beam transceiver to communicate with the departing machine. Mawhrin-Skel stopped in midair; turned. Gurgeh held his breath, wondering what Chamlis could have said, and what the smaller drone might say in reply, knowing that it wouldn’t bother to keep its remarks secret, as Chamlis had.”
• Page 15 (mirror → ostrentatiously uncommunicable): “Mawhrin-Skel became a mirrored sphere, and in that ostentatiously uncommunicable mode swept out of the hall into the darkness.”
• Page 15 (blue): “‘Cretinous whelp,’ Chamlis said, fields frosty blue.”
• Page 15 (gunmetal → puzzlement): “‘A sheltered upbringing?’ Chamlis Amalk-ney said. ‘On a GSV?’ Its gunmetal aura indicated puzzlement.”
• Page 16 (red): “‘Just what I need,’ Chamlis said, aura dully red.”
• Page 19 (rosy): “‘So people can live on it?’ Chamlis suggested, fields rosy.”
• Page 31 (blue, yellow): “He heard a roaring noise in the sky, and looked up to see a farside-lit vapor-trail overhead, steeply angled and pointing to the slope uphill from Ikroh. There was a muffled bang over the forest above the house, and a noise like a sudden gust of wind, then, zooming round the side of the house, came a small drone, its fields bright blue and striped yellow.”
• Page ? (blue): “‘I’ve found your young adversary,’ the small drone announced. It extended one softly glowing blue field and plucked a nightflower from a growing vine.”
• Page 45 (blue → formal, green → friendliness): “‘Well enough.’ He watched Mawhrin-Skel maneuver itself beside Olz Hap, floating over the table beside her plate, fields all formal blue and green friendliness.”
• Page 46 (red → pleasure): “Mawhrin-Skel’s fields glowed red with pleasure, momentarily brighter than the coals. ‘Oh good,’ it said. ‘A fight.’”
• Page 46 (white → anger): “‘Yes, I’d like you to,’ Gurgeh said, watching Mawhrin-Skel’s fields flicker white with anger in front of him.”
• Page 47 (white → rage): “Mawhrin-Skel’s fields blazed brightly, painfully white, lighting up the entire balcony for a second; people stopped talking and turned; the music hesitated. The tiny drone seemed almost literally to shake with dumb rage.”
• Page 47 (red → happiness): “Chamlis Amalk-ney, red with happiness, tipped to look up into the dark sky, where a small hole appeared briefly in the cloud cover. ‘Oh dear,’ it said. ‘Do you think I said something to upset it?’”
• Page 62 (gray → frustration): “He turned back into the room again. Something about the square, the whole village, disgusted and angered him. Yay was right; it was all too safe and twee and ordinary. They might as well be on a planet. He walked over to where Chamlis floated, near the long fishtank. Chamlis’s aura was tinged with gray frustration. The old drone gave an exasperated shudder and picked up a little container of fish-food; the tank lid lifted and Chamlis sprinkled some of the food grains onto the top of the water; the glittering mirrorfish moved silkily up to the surface, mouths working rhythmically.”
• Page 77 (red → laugh): “For the first time, the drone showed an aura, flashing briefly red. There was a laugh in its voice, too. ‘I wouldn’t expect you’d get very far trying that. No; the empire falls under the general definition of a ‘state,’ and the one thing states always try to do is to ensure their own existence in perpetuity.’”
• Page 91 (blue → formal): “‘A decision.’ The machine floated level with his face. Its fields were formal blue. ‘Will you speak for me?’”
• Page 91 (blue, brown, gray): “‘A … condition?’ the drone said. Its fields became briefly visible, a glittering mixture of blue and brown and gray.”
• Page 95 (orange-red): “Mawhrin-Skel’s fields glowed orange-red. It floated over to Gurgeh, its gray body shining brightly, fields all but extinguished in the bright sunshine. ‘Thank you,’ it said to him. ‘I wish you a good journey, and much luck.’”
• Page 110 (yellow-green → mellow approachability): “‘Good day, Jernau Gurgeh,’ said the drone Flere-Imsaho in its squeaky little voice, settling delicately on the plump arm of the chair. As usual, its aura field was yellow-green; mellow approachability.”
• Page 110 (purple → contrite, silver → do-not-disturb): “Gurgeh looked down at the drone. ‘I see,’ he said coldly. ‘Well, I was growing tired of the problem anyway.’ He turned back to the equations, adjusting the floating terminal so that its screen hid Flere-Imsaho from his sight. The drone stayed silent, went a confused medley of contrite purple and do-not-disturb silver, and flew away.”
• Page 111 (yellow-green → mellow approachability/calm friendliness, white → anger): “‘Have you seen this!’ Flere-Imsaho yelped one day, floating quickly up to him in the pool’s airstream cabinet, where Gurgeh was drying off. Behind the little machine, attached to it by a thin strand of field still colored yellow-green (but speckled with angry white), there floated a large, rather old-fashioned and complicated-looking drone.”
• Page 114 (gray yellow → resignation): “Flere-Imsaho and the ship remote made a show of looking at each other, then the small library drone flushed gray yellow with resignation, and said in its high voice, ‘All right, let’s go back to the beginning …’”
• Page 123 (yellow-green): “‘Well what, Jernau Gurgeh?’ Flere-Imsaho said, its yellow-green fields extending from its tiny casing like the wings of some exotic insect. It laid a ceremonial robe on Gurgeh’s bed. They were in the module, which now rested on the roof-garden of Groasnachek’s Grand Hotel.”
• Page 143 (black): “Gurgeh got in touch with the ship that night. Flere-Imsaho had declared itself bored; it had discarded its casing, gone blackbody, and floated off unseen into the night to visit a city park where there were some nocturnal birds.”
• Page 153? (rosy): “The man left the module’s lounge. The little drone hovered steadily in midair for a while. ‘Oops,’ it said to itself, eventually, then, with a shrug-like wobble, swooped away, fields vaguely rosy.”
• Page ? (gray → frustration, green-yellow): “Gurgeh turned away from the drone and back to the module-screen, where he was studying some classic ten games. Flere-Imsaho was gray with frustration. The normal green-yellow aura it displayed when out of its disguise had been growing increasingly pale over the past few days. Gurgeh almost felt sorry for it.”
• Page ? (green-yellow): “Gurgeh turned away from the ‘I believe so. I think I know you well enough to tell. Please come, Jernau Gurgeh. You’ll be glad, I swear. Please come. You did say you wouldn’t sleep, didn’t you? Well then, what do you have to lose?’ The drone’s fields were their normal green-yellow color, quiet and controlled. Its voice was low, serious.”
• Page ? (yellow-green): “The blade snapped, clipped off by a flickering yellow-green field. Nicosar felt the weight of the sword change, and looked up in disbelief. The blade dangled uselessly in midair, suspended from the little white disk that was Flere-Imsaho.”
• Page ? (green-yellow): “Nicosar threw the sword-handle at Gurgeh; a green-yellow field caught it, propelled it back at Nicosar; the Emperor ducked. He staggered across the board in a storm of smoke and swirling leaves. The cinderbuds thrashed; flashes of white and yellow burst from between their trunks as the wall of flames above them beat toward the castle.”
• Page ? (orange-red): “Gurgeh’s pale, pinched face broke into a smile. He put his bag down and looked at them both: Yay, fresh-faced and grinning, leaping over the couch; and Chamlis, fields orange-red, setting the tray down on the table before the banked fire. Yay thudded into him, arms round him, hugging him, laughing. She drew back.”
• Page ? (red): “Gurgeh presented the heavy little trophy to Chamlis, who went red with pleasure. ‘You vindictive old horror,’ Yay snorted.”
• Page ? (rosy → amused): “The screen displaying what the scout missile could see showed a tree a hundred meters behind the last, trundling wagon. The tree jerked and the top three-quarters slid at a steep angle down the sloped stump that was the bottom quarter before toppling to the dust. ‘That took a flick,’ the drone said, glowing briefly rosy again and sounding amused. The wagons and siege engines filled the view coming from the knife missile. ‘The first bit’s actually the trickiest …’”

Use of Weapons (1990)

FIXME: This book has not yet been searched for drone color references using method outlined in Appendix. /16 February 2026

Some Notes: When cleaning up and throwing away old papers, I found some notes from when I was (re-)reading Use of Weapons. I thought I’d better add the stuff to this page. /zrajm, 23 January 2007

• Page 19 (purple -> regret, gunmetal → puzzlement): “the mixture of purple regret and gunmetal puzzlement looked distinctly unconvincing.”
• Page 19 (dark): “going dark with sorrow”
• Page 19 (rainbow → surprise): “The drone flashed rainbow in surprise”
• Page (red) 40: “The blade broke cleanly on a bump of red coloured field just above the machine’s casing…”
• Page 40 (red): “Both field components where shaded deep red, the colour of drone pleasure.”
• Page 54 (grey, rosy): “ME NEITHER it printed on it’s aura field, in letters of grey on a rosy background.”
• Page 54 (blue → formal, pulsing red → laughter): “[…] glancing at the drone, which was keeping a standard pattern of formal blue on its aura field, apart from one large red dot on its side that probably only she could see; it was pulsating rapidly. When she noticed it she almost started laughing herself.”
• Page 55 (red): “Sma was aware of Skaffen-Amitskaw glowing red just behind her.”
• Page 56 (orange): “[…] its aura field flashing the lurid orange that was used to signal Sick Drone in Extreme Distress.”
• Page 77–78 (red): “Its red glowing field looked at least partially as a comment”
• Page 79 (olive/purple → awe): “field set a weird mixture of olive and purple, which she seemed to remember indicated Awe.”
• Page 85 (purple → contrition): “Skaffen-Amitskaw flashed a delicate shade of purple, imitating contrition”
• Page 101 (frosty): “[…] as Skaffen-Amtiskaw’s fields went frosty.”
• Page 122 (pink → amusement): “Skaffen-Amtiskaw’s fields glowed pink with amusement.”
• Page 256 (pink → amusement): “‘Hmm?’ the machine said, its aura field flashing the pink he was beginning to identify as drone amusement.”

The State of the Art (1989)

FIXME: This book has not yet been searched for drone color references using method outlined in Appendix. /16 February 2026

(missing)

Excession (1996)

NOTE: This book has been searched for drone color references using method outlined in Appendix. Edition used here makes use of British spelling (‘grey’, ‘colour’ etc). /15 February 2026

• Page 102 (white → angry): “‘What?’ yelped Churt Lyne. The drone darted round in front of her; she almost bumped into it. ‘Ulver!’ the machine said, sounding angry. Its aura field flashed white. ‘Really!’”
• Page 103 (yellow green → calm friendliness): “The drone took her hands again in fields coloured yellow green with calm friendliness, bringing her down off her toes. ‘Young lady,’ it said. ‘I shall never say anything more truthful to you than these two things. One; there will be plenty more gorgeous young men in your life. Two; you will never have a better chance of getting into Contact, even Special Circumstances, and with them owing you a favour; or two. Do you understand? This is your big chance, girl.’”
• Page 106 (white): “‘Didn’t even know this place existed,’ she said, drawing one black-gloved finger along the desk’s surface. The displays altered and the desk made a chirping noise; Churt Lyne slapped her hand away, going ‘tssk’ while its aura field flashed white. She glowered at the machine, inspected the grey rim of dust on her finger tip, and smeared it on the casing of the drone.”
• Page 107 (blue → formal): “‘Right,’ the drone said. A maniple field coloured formal blue extended from the machine’s casing and dragged a small sculpted metal seat over, placing it behind her and then shoving it quickly forward; she had no choice but to plonk down into it.”
• Page ? (frostily blue): ‘Well, if you hadn’t turned off the date/time function …’ muttered the drone, colouring frosty blue. Ulver rolled her eyes again. ‘The Excession was discovered and that signal sequence plus comments dates from twelve days ago. The Excession’s discovery was announced through the standard channels the day before yesterday.’
• Page 115 (? → embarrassment): “‘Wehhll,’ Churt Lyne said, drawing the word out while its aura-field coloured with embarrassment and its body wobbled in the air, ‘technically – maybe – the ability to travel – easily – to other universes.’ The machine paused again, looking at the human and waiting for her sarcastic reply. When she didn’t say anything, it continued. ‘It should be possible to step outside the time-strand of our universe as easily as a ship steps outside the space-time fabric. It might then become feasible to travel through superior hyperspace upwards to universes older than ours, or through inferior hyperspace downwards to universes younger than our own.’”
• Page 125 (grey → frustration): “‘No I’m not. I’m just saying it’s … semi-possible.’ The drone’s aura field flickered grey with frustration. ‘In that event, though, I don’t think it would be breakability they’d be worried about.’”
• Page 126 (grey): “‘Oh good grief, no,’ the drone said, its aura field briefly grey again.”
• Page 126 (grey): “‘No you’re not,’ hissed the drone, aura fields going deep grey. ‘You just have to be there.’”
• Page ? (grey → frustration): “‘Oh,’ the machine said, aura field briefly grey with frustration. ‘All right. Late breakfast. But before noon, in any event.’”
• Page 175 (blue → formal, rosy → humor): “It lifted out of her way, then turned smoothly and followed her across the floor of the bedroom towards the bathroom, its fields formal blue but tinged with a rosy humour.”
• Page 179 (grey → frustration, off-black): “The goodbyes took a while. Churt Lyne glowed greyer and greyer with frustration until it turned into a sort of off-black sphere; then it dropped its aura field altogether and sped out of the nearest opened window. It raced around in the air outside for a while; a couple of sonic booms nearly had the mounts bolting.”
• Page 179 (blue): “Eventually, though, Ulver had said her farewells, decided to leave all her animals and two trunks of clothes behind and then - having remained serene in the midst of much hullabaloo and some tears from Klatsli - entered a traveltube with a frostily blue Churt Lyne and was taken to the Forward Docks and a big, brightly lit hangar, where the Psychopath Class ex-Rapid Offensive Unit Frank Exchange of Views was waiting for her.”
• Page 221 (rosy → humor): “Gestra stared at the drone, obviously distressed, but the machine patted him on the shoulder with a rosy field and said, ‘It’ll be all right, Gestra. I thought it only polite to grant their request, but you can stay out of their way if you like. Saying hello to them at first would probably go down well, but it isn’t compulsory.’ The Mind had its drone study the man for a moment, checking his breathing, heart rate, pupil dilation, skin response, pheromone output and brain-waves. ‘I know what,’ it said soothingly, ‘we’ll tell them you’ve taken a vow of silence, how’s that? You can greet them formally, nod, or whatever, and I’ll do the talking. Would that be all right?’
• Page 285 (grey → frustration, brown → displeasure/ill-humor, white → anger): “Somehow, it gave the impression that it was staring at the screen. Its aura field was flickering as though it was undergoing rapid mood-changes; mostly it displayed a mixture of grey, brown and white.—Frustration, displeasure and anger. Not an encouraging combination.”
• Page 328 (blue): “Genar-Hofoen could see the girl’s suit shaking; it started to rock from side to side. She must be throwing herself around inside it as best she could. The suit came close to overbalancing and falling. The little slave-drone extended a blue field to steady it. Genar-Hofoen wondered how strong the urge had been to just let it fall.“

Look to Windward (2000)

NOTE: This book has been searched for drone color references using method outlined in Appendix. Edition used here makes use of British spelling (‘grey’, ‘colour’ etc). /15 February 2026

• Page 15 (magenta → busy): “Its aura field, confined to a small volume directly underneath its flat base, was a soft blush of magenta, which, if Kabe recalled correctly, meant it was busy. Busy talking to him?”
• Page 17 (blue-grey → politely held-in-check frustration): “‘Tersono,’ Ziller said, turning at last to the drone, which had lowered itself to his shoulder level and edged closer and closer as it had tried to attract the Chelgrian’s attention over the past few moments, during which time its aura field had just started to shade into the blue-grey of politely held-in-check frustration.”
• Page 20 (gunmetal → puzzlement): “The drone’s gunmetal aura indicated puzzlement. ‘We don’t know.’”
• Page 20 (muddy cream → embarrassment; red): “‘Excessive,’ Ziller said pointedly. The drone’s aura field flushed a sort of muddy cream colour to indicate embarrassment, though a few flecks of red indicated it was hardly acute.”
• Page 21 (ruddy orange): “‘Without?’ Tersono said, field glowing a ruddy orange. ‘Why, as I say, you have almost nothing but–’”
• Page 21 (purple): “The drone’s aura lapsed back to purple. It wobbled minutely in the chair. ‘You are welcome to try, my dear Ziller. However that might be taken as a terrible insult.’”
• Page 21?/22? (purple): “The drone, misted in purple, went quiet for a moment. Kabe shifted on his cushions. ‘The point is,’ Tersono continued, ‘that even the most wilful and, ah, characterful of ships might not accede to the sort of request you have indicated you might make. In fact I’d wager quite heavily on it that they wouldn’t.’”
• Page 24 (aquamarine → modesty): “‘Oh, we had a real one,’ Ziller said. ‘I thought we’d have an image.’ He looked at Tersono, which allowed itself a faint glow of aquamarine modesty.”
• Page 24 (rainbow → surprise): ‘Really?’ the drone’s aura rainbowed with brief surprise. ‘For whom?’
• Page 127 (blue-pink): “Chomba was glaring at the drone. Quilan tilted his head to see past Tersono’s body and look at her as Tersono, extending a blue-pink field in an arc towards the Chelgrian’s shoulders, ushered him forwards. The floating platform carrying Quilan’s bags followed him into the module; the doors closed and became a screen again. ‘Now,’ said the drone, ‘we are all here to say welcome, obviously, but also to let you know that we are entirely at your disposal for the duration of your visit, however long that may be.’” (NOTE: To me “blue-pink” sounds like an impossible color, but Banks elsewhere use “blue-pink” in reference to the sky [in Consider Phlebas], and the sky at dawn [in The Player of Games] and so I think its meant to refer to a single hue, not a pattern of two colors.)
• Page 128–129 (rosy): “‘Cr Ziller continues to grace us with his presence,’ Tersono agreed. Its aura field looked very rosy against the cream of the couch it rested on. ‘Hub here is being very modest in not immediately extolling the numerous virtues of Masaq’ Orbital, but let me assure you it is a place of almost innumerable delights. Masaq’ Great–’
• Page 129 (blush → pleasure, frosty blue): “‘He would claim not to be,’ Kabe said, ‘though I think in his music over the last few years I have detected a certain plaintive harking back to traditional Chelgrian folk themes, with hints of eventual resolution implicit in their serial development.’ From the corner of one eye, Kabe saw Tersono’s aura field blush with pleasure as he said this. ‘Though that may mean nothing, of course,’ he added. The drone’s field collapsed back to a frosty blue.”
• Page 129 (purple): “‘The darling child may find the maestro’s music still beyond her,’ the drone said. Kabe caught a hint of a blossoming purple field flattening and dissipating in the direction of the girl sitting on the edge of the pool. He saw Chomba’s mouth work but suspected Tersono had thrown some sort of field wall between her and the rest of the party. He could just about hear that she had said something, but had no idea what it was. Chomba herself either hadn’t noticed or didn’t care. She was concentrating on the fish.”
• Page 133 (rosy → approval): “They had asked him whether he wanted to go straight to the house they had provided for him, or if he would like to take in part of Masaq’ Great River, and one of its famous barges, where a small reception had been arranged. He’d said he would be happy to take them up on their kind offer. The Hub avatar had looked quietly pleased; the drone Tersono had positively glowed with rosy approval.”
• Page 211 (grey/gunmetal, magenta/violet): “‘Is that what those colours mean?’
  ‘I don’t think so.’
  ‘That’s just grey, isn’t it?’
  ‘I think technically it’s gunmetal.’
  ‘And is that magenta?’
  ‘More violet. Though of course your eyes are different from mine.’
  ‘Ahem.’”
• Page 304 (ruby): “‘Oh! I’m sure he is just teasing us,’ Tersono said quickly. Its aura field positively shone with ruby light. ‘Of course Cr Ziller will be there. How could he not be? He’ll be there. I’m quite certain.’”
• Page 304 (blue): “‘Oh no!’ Tersono said, aura flushing briefly blue. ‘There’s no need for that. No, not at all; I’m sure that Cr Ziller has every intention of being there. He may leave it until the last moment before he sets off, but set off he will, I’m quite positive. Please, Major Quilan, you must be there for the concert. Ziller’s first symphony in eleven years, the first ever première outside Chel, you, coming all this way, you two the only Chelgrians for millennia … You must be there. It will be the experience of a lifetime!”
• Chapter 14, page? (pink → ¿upbeat/perky?) “‘So. My friends; shall we go?’ the drone E. H. Tersono said chirpily. Its ceramic casing was surrounded by a healthy pink glow.”
• Page 316 (pink/blushed): “Ziller stuck his big black nose up towards Tersono’s pink-blushed ceramic casing, causing the drone to shrink back from him. ‘I do not believe you,’ he told it.”
• Page 316 (rainbow → confusion): “‘Well…’ The drone’s aura field suddenly rainbowed with confusion.”
• Page 316: (→ anger/frustration): “‘Well, of course I would!’ the machine said, wobbling in the air with what looked like anger, frustration or both. Its aura field looked confused.”
• Page 316 (muddy cream → embarrassment): “The Chelgrian turned sharply to the machine floating at his side and glared at it. He held one finger to his lips and shook it. The drone went muddy cream with embarrassment. ‘I am talking to you by directly vibrating the inner membrane of your ear. There is no possibility that the animal you–’”
• Page 317 (blanched → anger, grey → frustration, purple → contrition, yellow-green → mellowness/friendliness, red → a joke): “The drone’s aura blanched briefly with anger, then settled to grey frustration mixed with spots of purple contrition. It quickly rippled into yellow-green, indicating mellowness and friendliness, hatched with bands of red to show it was taking this as a bit of a joke.”
• Page 318? (grey → frustration): “He woke up spluttering in the shallows, being dragged on his back towards the river bank. He looked up and behind and saw Tersono pulling him with a maniple field coloured grey with frustration.”
• Page 318? (grey): “The drone flashed grey again. ‘Of course I’m upset, Cr Ziller! You nearly killed yourself there! You’ve always been so dismissive, even contemptuous, of such dangerous pastimes. What is the matter with you?’”
• Page 324 (white → anger): “‘Will you stop it?’ screeched the drone. Its aura field burned white with anger.”
• Page 324 (grey): “‘You did make an exhibit of yourself!’ the machine shouted. ‘That simian in the trees by the river was Marel Pomiheker; news-feeder, guerrilla journalist, media-raptor and all-round data-hound. Look!’ The drone swept away from the screen and pointed a strobing grey field at one of the twenty-four rectangular projections protruding from the screen. It showed Ziller squatting on a branch, hiding up a tree in a jungle.”
• Page 380 (creamily rainbow → surprise/embarrassment): “The drone stopped as though it had hit a wall. It flushed creamily rainbow with surprise and embarrassment, then bowed in the air and said, ‘Just so. Well, see you there. Ah … Yes. Goodbye.’ It thrummed through the air to the doors, whisked them open and closed them quickly but silently behind it.”

Matter (2008)

FIXME: This book has not yet been searched for drone color references using method outlined in Appendix. /16 February 2026

• Page 5 (rosy → fun): “The drone’s aura fields, invisible until now, flowed rosily for a moment or two. ‘This,’ it said, ‘should be fun.’”
• Page ? (rosy → amused): “The screen displaying what the scout missile could see showed a tree a hundred metres behind the last, trundling wagon. The tree jerked and the top three-quarters slid at a steep angle down the sloped stump that was the bottom quarter before toppling to the dust. ‘That took a flick,’ the drone said, glowing briefly rosy again and sounding amused. The wagons and siege engines filled the view coming from the knife missile. ‘The first bit’s actually the trickiest…’”
• Page 78 (frosty blue): “‘We have been summoned,’ the machine said. ‘We need to get to the Quonber; Jerle Batra awaits.’ Its fields flashed a frosty blue. ‘I brought the module.’”
• Page ? (rosy): “It twisted itself slowly into the material as though it was no more substantial than the glowing purple mass beneath. Long hanging strands of hull and other material worked their way out along the little machine’s body and drooped down, swaying. The drone – rosily glowing folds of light pulsing about its body – finished by stationing itself midway between the scendship’s hull and the wall of the chamber and floating there for a moment. There was an alarming groaning noise and the hull of the ship around the hole bulged inwards by about a hand’s span, exactly as though an invisible sphere a metre across was being pressed into it. The wall directly opposite made creaking, popping noises too. ”
• Page ? (soot black): “The door rolled silently to one side, revealing utter darkness. The drone turned soot black and darted ahead, disappearing along with the four other smaller missiles.” (NOTE: Color used for camouflage here?)

Surface Detail (2010)

NOTE: This book has been searched for drone color references using method outlined in Appendix. Edition used here makes use of British spelling (‘grey’, ‘colour’ etc). /16 February 2026

• Page 229 (yellow, green, blue): “The machine floated in the air in front of her. It was about big enough to sit comfortably on two outspread hands; a cream-casinged, mostly smooth device that looked like something you’d find on the work surface of an intimidatingly well-equipped kitchen and wonder what its function was. It was surrounded by a vague, misty halo that appeared to be various mixtures of yellow, green and blue according to the angle. This would be its aura field – the drone equivalent of facial expression and body language, there to convey emotions.”
• Page 234 (grey-blue): “‘I see.’ The machine bobbed in the air, its aura field going grey-blue. ‘Well, as I say, while we’re aboard ship… Excuse me.’”
• Page 241 (pink): “The little drone’s aura field glowed an agreeable pink. It turned smoothly back to Lededje. ‘As we all agree, then, I shall be coming with you, still charged, of course, with protecting you—’”
• Page 241 (grey): “‘Mostly from yourself,’ Demeisen said with a quick grin. He bowed his head and held up one hand as the little cream-coloured drone’s field flashed a bright grey. ‘Sorry,’ he said.”
• Page 214 (grey): “Kallier-Falpise’s fields went frosty grey again. ‘You did not ask me if I consent to being Displaced when a far more intrinsically safe method of transferring us between ships exists to hand.’”
• Page 214? (yellow-orange, white → anger): The boxy-looking ship-drone used its own light effector unit to administer the equivalent of a slap. Kallier-Falpise trembled against the ceiling fixtures, then dropped, side-slipping. It flashed a strident yellow-orange for an instant, then it seemed to shake itself. It straightened, floating down to the same level as the ship-drone, its aura field glowing white with anger.
• Page ? (blue → formal; green → good humour): “‘Allow me,’ said the ship’s drone, taking the offered device before Yime could accept it. They were still under the ship itself, so sheltered from the rain for the moment. It was so dark the main light came from the big drone’s aura field, which was formal blue mixed with green good humour.”
• Page ? (blueish, pink): “Yime sighed, put her drink down and sat back, fingers interlocked over her midriff. ‘And I’m sure I shall continue not to until you enlighten me. Or I can talk to somebody else on your team who is more…’ She paused. ‘Plausible,’ she said. The drone’s blueish aura field coloured a subtle shade of pink.”
• Page ? (pink): “The drone made a throat-clearing noise. ‘Whoever they were they either died in a fire or were cremated,’ it said. ‘Probably the latter; high-temperature combustion, probably few impurities. Hard to tell – this has been cleaned and analysed. At first quite crudely and then only a little clumsily.’ The machine swivelled in the air as though looking at Veppers. ‘By Mr. Veppers’ techs and then by our Jhlupian friends, I’d guess.’ The barely visible haze around the machine had turned vaguely pink. Veppers ignored it.”
• Page ? (blue): “Meanwhile the drone Olfes-Hresh had snapped through the air to her other side, whipping a blue-glowing force field between her torso and Veppers’ and gripping her left arm, keeping that hand held up and away. Lededje heard herself make an anguished, strangling noise as she tried to close her fingers round Veppers’ throat.”
• Page ? (ruby-red): “‘Gasslikunt!’ Liss repeated, cradled in ruby-red fields as the drone took the child and swept away towards the doors.”
• Page ? (purple-grey → embarrassment): “‘As did I,’ the machine said, aura field purple-grey with embarrassment.”

The Hydrogen Sonata (2012)

NOTE: This book has been searched for drone color references using method outlined in Appendix. Edition used here makes use of British spelling (‘grey’, ‘colour’ etc). /15 February 2026

• Page 244 (blue-grey): “The little drone suddenly developed an aura field, turning a crisp blue-grey. ‘A mount? An animal?’ it said. ‘Four days? I had rather envisaged Displacing you at sub-millimetre accuracy, precisely where you want to go.’”
• Page 245 (red → amused): “The ship drone’s aura flashed amused red then disappeared. ‘I’ll see how that breakfast’s coming along.’”

Appendix

The text used was extracted from the e-book versions of all works in The Culture series.—The novels The Bridge (1986) and Inversions (1998) were also included (they both peripherally contain references to The Culture), however neither of them turned out to mention drone aura fields or their color.

Initially I took notes while reading the novels but in January 2026 I decided it was time for a more thorough approach.

A list of color terms was created from my earlier notes. Thereafter I used an LLM to find additional likely color terms (adding, among others: aqua, charcoal, coral, lavender, lilac, navy, ochre, salmon, teal, taupe, maroon, sand, tan—most of which do not occur in the text). I also manually added color terms as I found them during the search of the text (agate, azure, blond, blonde, cerulean, dark, lime, silvery, soot).

The final list of colors used was: agate, aqua, aquamarine, azure, beige, black, blond, blonde, blue, blueish, bronze, brown, burgundy, cerulean, charcoal, colored, copper, coral, cream, cream, crimson, cyan, dark, dim, dun, gold, gray, green, grey, gun-metal, gunmetal, indigo, lavender, lilac, lime, magenta, maroon, mint, mirror, mud, muddy, navy, ochre, olive, orange, orange, pale, peach, pink, purple, rainbow, rainbowed, red, rosy, ruby, ruddy, salmon, sand, silver, silvery, sky, tan, taupe, teal, turquoise, violet, wan, white, yellow.

The above colors are combined into a regular expression \b(COLOR1|COLOR2|…)(er|ish|s|y)?\b.