File:EB1911 Vision - Illusion of Direction.jpg
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Summary
| Description |
English: As the retina is a curved surface, a long straight line, especially when seen from a distance, appears curved. In the figure, a curious illusion of direction, first shown by J. K. F. Zoellner, is depicted. If these lines be looked at somewhat obliquely, say from one corner, they will appear to converge or diverge, and the oblique lines, on each side of the vertical lines, will appear not to be exactly opposite each other. But the vertical lines are parallel, and the oblique lines are continuous across them. The effect is evidently due to an error of judgment, as it may be controlled by an intense effort, when the lines will be seen as they really are. |
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| Date | published 1911 | |||
| Source | “Vision,” Encyclopædia Britannica (11th ed.), v. 28, 1911, p. 142, fig. 27. | |||
| Author | Unknown artist | |||
| Permission (Reusing this file) |
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 21:09, 17 September 2021 | | 683 × 725 (307 KB) | Bob Burkhardt | {{Information |description = {{en|1=As the retina is a curved surface, a long straight line, especially when seen from a distance, appears curved. In the figure, a curious illusion of direction, first shown by J. K. F. Zoellner, is depicted. If these lines be looked at somewhat obliquely, say from one corner, they will appear to converge or diverge, and the oblique lines, on each side of the vertical lines, will appear not to be exactly opposite each other. But the vertical lines are parallel... |
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