Line Length Muller-Lyer Optical Illusion

Which line is longer?

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They are both the same.

Explanation

This is one of the most studied optical illusions. It was created by a German psychiatrist named Franz Müller-Lyer in 1889. It is not well understood why this optical illusion works, but we think it because the first object is simply larger, and the second object is pointed.

See a variation of this class of Müller-Lyer optical illusions.