A combined pocket size Hyperscope & Psudoscope,
and more.

Discover the Eyebenda
here...

• Blank, Albert A. Metric Geometry in Human Binocular Perception: Theory and Fact. Formal Theories of Visual Perception. Leeuwenberg, 1978.

• Brewster, David. The Stereoscope. Morgan and Morgan. 1856 Edition.

• Dewdney, A.K. Computer Recreations. A program for rotating hypercubes induces four-dimensional dimentia. Scientific American, Feb. 1986.

• Ernst, Bruno. The Magic Mirror of M.C. Escher. Ballantine N.Y.C. 1976.

• Gardner, Martin. Mathematical Carnival. Is it possible to visualize a 4-dimensional figure? Vintage Books 1917.

• Gibson, J.J. The Perception of The Visual World. Harvard University Press 1950.

• Wade, Nicholas. Brewster and Wheatstone. Academic Press 1983.

• Walker, Jearl. The Amateur Scientist. The hyperscope and the pseudoscope aid experiments on three-dimensional vision. Scientific American Nov.1986.