Zöllner illusion
Definition[edit | edit source]
The Zöllner illusion is an optical illusion named after its discoverer, German astrophysicist Johann Karl Friedrich Zöllner.
Discovery[edit | edit source]
In 1860, Zöllner sent his discovery in a letter to physicist and scholar Johann Christian Poggendorff, editor of Annalen der Physik und Chemie, who subsequently discovered the related Poggendorff illusion in Zöllner's original drawing.
Similar to Hering illusion[edit | edit source]
This illusion is similar to the Hering illusion, the Poggendorff illusion and the Müller-Lyer illusion.
Distorted lines[edit | edit source]
All these illusions demonstrate how lines can seem to be distorted by their background.
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Contributors: Prab R. Tumpati, MD
