New answers tagged vision
Actually, black objects absorb light across visible frequencies indiscriminately, but not completely. So some light still reflects off them. This is described on this Q&A of the Department of Physics, University of Illinois at Urbana-Champaign. But even if there was a perfectly black objects which absorbs 100% of the light that falls on it, you could ...
Usually, for something to be 'real', we want it in some reasonable manner to be objective or (because that is extremely vague) at least very consistent across subjective observers. Unfortunately, colour does not satisfy this. Physical basis: As explained very well by @Stop_forgetting_my_account: Physics does not have colour, it just has a continuous ...
Here's a good set of eye exercises: http://eyepitstop.com
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