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4

I disagree that it's an optical illusion at all, but OK, first an obligatory XKCD and it's matching Explain XKCD (and XKCD does present it as an optical illusion, so this goes against my theory - see below): ...


6

My half-baked hypothesis: The world accidentally stumbled upon the first (to my knowledge) bi-stable color illusion Here is an example of bistable illusion: This bistable illusion involves the perception of motion. Is the dancer spinning clockwise or counterclockwise? The deal is that the image is actually ambiguous. But you can't possible perceive both ...


1

Lighting in the store makes a lot of difference. Though there isn't much incandescent any more, florescent bulbs vary. The reflective properties of the area matter, too. My biggest problem is matching socks having a brown component with my clothes. Under one light they're brown. Under another light they're green. When I get to work I'm dismayed. Also, ...


2

The issue is probably the same as with fruits. Different lights produce different appearance. LED light has been shown to produce daylight appearance. I however can't find a high quality source. http://news.discovery.com/human/led-lights-grocery-shopping-110308.htm


2

It's difficult to say why this happened in your particular situation, but one contributing factor may be that color perception is relative. How a particular color is perceived depends on the surrounding colors. The best way to demonstrate this is through an optical illusion: It looks like there are two different color hearts, but all of the hearts are ...



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