But the point is, there is no line which separates white and black (or green and blue). 50% grey is neither black nor white, it's grey. Turquoise is neither green nor blue, it's turquoise.

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JasonSage 4 hours ago | parent | next [-]

I see it as having a blue component and a green component. If the mixture has more green than blue, then it's green.

The analogous version in black and white is "is this dark grey or light grey?" because that's the one asking you to guess which side of the 50/50 split the color is on.

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airstrike 4 hours ago | parent | prev | next [-]

Ok, but presumably you can make a test that goes from 50% gray to 100% black and you have to say "this is black" or "this is gray"

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MattGaiser 4 hours ago | parent | prev | next [-]

No scientific line. But where does your mind put it if asked without being told which it is? This test is about where you perceive that line to be.

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miltonlost 4 hours ago | parent | prev [-]

but when does turquoise start and end and green starts and blue ends? or is there just another color there between them. And then what about that color?

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addaon 3 hours ago | parent [-]

I think you're (accidentally?) hitting on exactly the point there.

For some people's language usage, blue and green are adjacent colors, and thus defining a point that divides them is perfectly fine.

For other people, these are not adjacent -- for some people, there's a single color (aqua? turquoise?) between them, and green and turquoise are adjacent colors, as are turquoise and blue, and it's reasonable to ask about a dividing point between those adjacent pairs.

For those who don't use language this way -- do you consider red and blue adjacent, or do you consider purple (violet?) a necessary intermediate? Are you comfortable defining a point between red and blue, or are you instead comfortable defining a point between red and purple, and a point between purple and blue?

And for all I know, there are people for whom blue and green (or blue and red) have a distance greater than one, or greater than two...

	▲	tshaddox 24 minutes ago \| parent [-]
		Are there really people whose language treats “cyan” and “turquoise” as distinct colors which are not in the “blue-green” family?