Jastrow illusion

The Jastrow illusion is an optical illusion attributed to the Polish-American psychologist Joseph Jastrow. This optical illusion is known under different names: Ring-Segment illusion, Jastrow illusion, Wundt Area illusion, Wundt-Jastrow illusion, or the Boomerang Illusion.

The illusion also occurs in the real world. The two toy railway tracks pictured are identical, although the lower one appears to be larger. There are three competing theories on how this illusion occurs.

This illusion is often included in magic kits and several versions are sold in magic shops, where it is commonly known under the name Boomerang Illusion.

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