5/ human eyes have rod cells (which are sensitive in low light situations, but which do not discriminate on colors) and cones (which are less sensitive, but do discriminate on colors and come in 3 varieties - by default - see alsohttps://en.wikipedia.org/wiki/Tetrachromacy#Humans …
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17/ also, obligatory shout out to "A Deepness in the Sky" where Vinge had a very quick passing reference to the Spider's having a color called "plaid" which packed so much into one word >>>https://twitter.com/pythonrocksnake/status/1437399518568398853 …
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18/ The implication, to my mind, was some sort of incomplete-sensor-fusion effect, off in the direction of human perceptions of "impossible" or "chimerical" colorshttps://en.wikipedia.org/wiki/Impossible_color …
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19/ LOL, damnit, the "impossible color" wiki article references the Vinge book I mentioned!
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