What are some great optical illusions?

In Optical Illusions: Answer added in topic Science.Nicholas Saint I'm not sure if 'optical illusions' includes illusions involving change blindness and related phenomena, but if so, here are some great ones:Change blindness (unfortunately these don't embed here. Click through, it's worth it. In each, you'll see two images repeatedly flashed with a plain grey image inbetween. There is a major difference between the two, and once you've figured it out, you can't *not* see it. Some people see some of them immediately, but it usually takes a while.)http://www.cs.ubc.ca/~rensink/fl...http://www.cs.ubc.ca/~rensink/fl...And a classic attention blindness example:http://www.youtube.com/watch?v=A...See question on Quora


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