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How is 'purple' both ligt at one wavelength and the sum of light at two different wavelengths?

This was pointed out by Newton after his investigation with prisms. A color can be the result of a single wavelength, or the combination of different lights with different wavelengths, called ...
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What does the visual feed from the retina look like before it is processed by the visual cortex?

There's a recent article on decoding retinal signals from primates (macaque monkeys) https://direct.mit.edu/neco/article/33/7/1719/100579/Nonlinear-Decoding-of-Natural-Images-From-Large
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