I don’t often post useless non-fishing-related nonsense on Tamanawis (read that carefully), but I couldn’t resist this amazing wee link. Discovered via the always interesting Astronomy Picture of the Day at NASA (see the Wiki here as well), comes the fascinating research of the Department of Brain and Cognitive Sciences at MIT.
Check out their page of optical illusions here (you’ll need to allow popups). I particularly like the Koffka Ring illusion..
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