Abstract
The term geometrical-optical illusions was coined by Johann Joseph Oppel (1815-1894) in 1855 in order to distinguish spatial distortions of size and orientation from the broader illusions of the senses. We present a translation of Oppel's article and a commentary on the material described in it. Oppel did much more than give a name to a class of visual spatial distortions. He examined a variety of figures and phenomena that were precursors of later, named illusions, and attempted to quantify and interpret them.
| Original language | English |
|---|---|
| Pages (from-to) | 1-18 |
| Number of pages | 18 |
| Journal | I-Perception |
| Volume | 8 |
| Issue number | 3 |
| Early online date | 23 Jun 2017 |
| DOIs | |
| Publication status | Published - Jun 2017 |
Keywords
- Oppel
- geometrical-optical illustions
- orientation
- size
- area
- contrast
- bisection
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