| Title | Six geometrical optical illusions |
|---|---|
| Department | Science and Engineering |
| Date | 2011-08-08 |
| Subject | Decorative ; Historical |
| Type | Image |
| Description | Textbook image of six geometrical optical illusions by Poggendorf(1860), Hering(1861), Muller-Lyer(1889), Delboeuf(1892) and Opel-Kundt(1895). Copyright unknown. |
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