And since the brain can be tricked to thinking that objects with mostly black and grey gradients are moving, like optical illusions, does that mean motion has a color?
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Based on your question: if fully color-blind people see whites, blacks, and greys, that means that humans can see them colors. After all, aren't color-blind people humans?
If you actually think about it, is color just created by evolved cells? If so, should we not see just black, grey, and white?