Known as the Munker-White illusion, as explained in the video above, our brains process what we see within a certain context. The result is that you can seriously trick your eyes if you mess around with the correct parameters. In this case, you could swear two colors are different (they are not) and even after you are shown that, upon adding back context elements, the lightness difference and the color illusion is introduced back in.
As skeptic as I can be, not only did I pause the video a couple of times to make sure the video wasn't switching colors on the fly, but I took some screenshots to Photoshop and compared the colors. Can I trust my eyes? I can certainly not.
If you are looking for other equally impressive and fun science facts, AsapSCIENCE's YouTube channel appears to be a formidable way to get you started.
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