Have you seen this? http://www.illusion-optical.com/Optical-Illusions/Chessboard... | Hacker News

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		endtime on Aug 5, 2011 \| parent \| context \| favorite \| on: Show HN: My weekend project - Chessboard picture r... Have you seen this? http://www.illusion-optical.com/Optical-Illusions/Chessboard...

matthiasb on Aug 5, 2011 [–]

I fell for this trick. Good to know! This is one thing a computer can easily be better than a human. I make me think it could be possible to build CAPTCHAs with optical illusions.

endtime on Aug 5, 2011 | [–]

Agreed that a computer can solve that much more easily, but my point was that just looking at a corner square wouldn't be sufficient.

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