Difference between revisions of "Poggendorff illusion" - New World Encyclopedia
(Copied from wikipedia) |
m |
||
| Line 7: | Line 7: | ||
<div style="float:right; margin: 0 0 1em 1em;">[[Image:poggendorf_illusion1.png]][[Image:poggendorf_illusion2.png]]</div> | <div style="float:right; margin: 0 0 1em 1em;">[[Image:poggendorf_illusion1.png]][[Image:poggendorf_illusion2.png]]</div> | ||
| − | 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 [[ | + | 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. | 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. | ||
| Line 13: | Line 14: | ||
== External links == | == External links == | ||
| − | * [http://www.cut-the-knot.org/Curriculum/Geometry/Illusion.shtml Poggendorf Illusion] | + | * [http://www.cut-the-knot.org/Curriculum/Geometry/Illusion.shtml Poggendorf Illusion] Retrieved April 18, 2007. |
| − | * [http://www.cut-the-knot.org/Curriculum/Geometry/CircularPoggendorf.shtml Circular Poggendorf Illusion] | + | * [http://www.cut-the-knot.org/Curriculum/Geometry/CircularPoggendorf.shtml Circular Poggendorf Illusion] Retrieved April 18, 2007. |
| − | + | * [http://www.enane.de/ontoform.htm Explanation of the Poggendorff, Hering, and Zoellner illusions] Retrieved April 18, 2007. | |
| − | * [http://www.enane.de/ontoform.htm Explanation of the Poggendorff, Hering, and Zoellner illusions] | ||
Revision as of 15:39, 18 April 2007
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.
Credits
New World Encyclopedia writers and editors rewrote and completed the Wikipedia article in accordance with New World Encyclopedia standards. This article abides by terms of the Creative Commons CC-by-sa 3.0 License (CC-by-sa), which may be used and disseminated with proper attribution. Credit is due under the terms of this license that can reference both the New World Encyclopedia contributors and the selfless volunteer contributors of the Wikimedia Foundation. To cite this article click here for a list of acceptable citing formats.The history of earlier contributions by wikipedians is accessible to researchers here:
The history of this article since it was imported to New World Encyclopedia:
Note: Some restrictions may apply to use of individual images which are separately licensed.
