Müller-Lyer Illusion

Estimation 16 March 2012 0 Comments

These three horizontal lines are all the same length.  Does the middle line appear to be longer than the top line?

Müller-Lyer Illusion

The arrows on the end of the lines give the impression that the lines are different lengths.  The red horizontal lines help to show that they are all equal.  This is known as the Müller-Lyer Illusion and was discovered in the late 19th century.

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