My IB Theory of Knowledge class just went over this. The 2 squares are said to be the same color, however, my class refused to believe that it was true. I didn't quite see the resemblance either. Its a tricky one.
I should have done this with the posting: Copy a section from both parts A and B, and compare. The proof is in the checker-shadow illusion's pudding!
I just went over this extensively in a Psych class. To prove that they are different, I photocopied the page it was on in the book, then cut out the two squares in question. When isolated from the rest of the image, they indeed are EXACTLY the same color. It's mind-boggling but true.
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