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Quickly...Name the colours that the words are written in. Don't read the words - just name the colours you see. 6 year old children can do this EASILY - and find it hilarious that adults have such a hard time of it! |
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Focus your eyes in the dot in the middle Move your head towards and away from the screen. Freaky! |
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Hint: arctan(2/5)!=arctan(3/8) |