Hering Illusion

Estimation 20 March 2012 0 Comments

Do the red lines below appear to bow outward?  Or are they parallel?

Hering Illusion

The red lines are straight and parallel and do not bow outward despite their appearance.  This illusion, known as the Hering illusion, was discovered in 1861 by a German physiologist named Ewald Hering.  The Hering illusion produces the opposite effect of the Wundt illusion.

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