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    http://www.gifbin.com/983889

    Pls explain
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    They've cut it out wrong. You can see a small gap between the triangles, and that amounts to 1 squares worth of space. Always be careful when looking at stuff like this, they usually increase the size of the shape or something to trick you.
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    seems like a type of "missing" square illusion
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    Similar
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    This works because the edges aren't straight, they're sloped, so a piece like this \______| will take up more space (from a top down view) than one like this |______|
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    Good party trick though!
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    I think it works cos humans are less accurate at perceiving area and angles than they are at lengths - which is also why pie charts are baaaaad.
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    (Original post by Joinedup)
    I think it works cos humans are less accurate at perceiving area and angles than they are at lengths - which is also why pie charts are baaaaad.
    and why people who like pies tend to .....
 
 
 
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