Which is the longer distance? between A and B ? or between B and C ? |
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Which is the longest line ? yellow or red one ?
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Is the stick clearer in top or bottom ? |
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What do you see ? A square ? |
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Did the red line join the green one at its end ? |
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| Optical illusion
of Kanizsa |
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What do you see ? A triangle ? |
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Do the squares form a perfect checkerboard ? |
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Are the squares bulged in the middle ? |
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| Optical illusion
of Kanizsa |
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