Saturday, February 09, 2008

I love optical illusions

I used to have a whole bunch on transparencies that I would put on the overhead projector and show my students on the last day of school. They're so fun and freaky (the illusions, not the students...well on second thought...). Anyway, I saw this one today on Boing Boing. Squares A and B below are the same shade of gray.

My first thought was NO WAY! But then I isolated the two squares in question, and sure enough--they're the same color!

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