e who parabolic floor inside of a large rotating sphere, which a part of the mechanism of seeing, and which is con- have become blind late in life, or whose fingers are may be entered through the center at the bottom. In trolled by the attraction of gravitation, as are the not very sensitive. They… … ently the spot on which she is standing. To her the man on the other side appears to be project- Fig. 5.—This picture shows how the rotating parabolic floor will sp except very slowly. A cyclist rid- ing horizontally from a vertical surface. The man cherishes the same illusion about the woman. pear…
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