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| | Mirage |
 | | Mirages are, in fact, a kind of optical illusion where the natural and reasonable assumptions of the visual sense are led astray, in this case by the curvature of light rays, which are so often straight lines from the object seen to the eye, as the eye always assumes, but here are not. |
 | | Mirages have been studied scientifically for a long while, and the literature is immense (although, unfortunately, inaccessible at the present time and place). |
 | | Mirages were well-known to the ancients, and this was the haunt of Scylla and Charybdis, malevolent haunters of the Straits who caused dangerous tidal currents there. |
| www.du.edu /~jcalvert/astro/mirage.htm (4543 words) |
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