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Parallelogram Optical Illusion

Which of two red lines in this image is longer?

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Are these two lines the same length in this optical illusion?


Scroll down for the answer and explanation.






Actually, they're the same length.


Yes, they really are exactly the same length. We expect pictures to represent objects which are square or made up of right angles. In this optical illusion, the eye computes the distance as though both boxes were square, which would support the conclusion that the one line is shorter since its box is only half the size of the other.

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