Poggendorff illusion
The Poggendorff Illusion is an optical illusion that involves the brain's perception of the interaction between diagonal lines and horizontal and vertical edges. It is named after Johann Poggendorff (1796-1877), a German physicist who first described it in 1860. The Zollner illusion is a classic optical illusion named after its discoverer, German astrophysicist Johann Karl Friedrich Zöllner. In 1860, Zöllner sent his discovery in a letter to physicist and scholar J. C. Poggendorff, editor of Annalen der Physik und Chemie, who subsequently discovered the related illusion that bears his name.
In the picture to the right, a straight black line is obscured by a red rectangle. The black line appears disjointed, although it is in fact straight; the second picture illustrates this fact.
External links
- Poggendorf Illusion Retrieved April 18, 2007.
- Circular Poggendorf Illusion Retrieved April 18, 2007.
- Explanation of the Poggendorff, Hering, and Zoellner illusions Retrieved April 18, 2007.
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