Thursday, September 07, 2006

Seeing Isn't Believing: Pseudoscopes

What?
A pseudoscope is an optical instrument that reverses depth perception. It is the most remarkable of all optical illusions. Objects viewed through it appear inside out. An example is illustrated here: a box on a floor, would appear as a box shaped hole in the floor.

Why?
Pseudoscopic perception is the result of switching the inputs to the eyes before they are fused, so that the right eye receives information normally received by the left eye, and the left eye receives information normally received by the right eye.

When?
The first public demonstration of a pseudoscope was in 1838.

Who?Sir Charles Wheatstone was the pioneer in mention. His stereoscope consisted of two mirrors at right angles to one another which reflected slightly different drawings to each eye. The depth that was seen depended upon the differences in the images (retinal disparity) and the direction the eyes were pointing (convergence). Therefore, the mirror stereoscope was the first truly binocular instrument.(click here to read one of Wheatstone's papers in 1852)

Where?There is only one pseudoscope for sale on the market. The Grand Illusions Pseudoscope M-X3 retails at UK GBP 499 (!!!!!). Be prepared to shell out UK GBP 544 (-faints-) to include a Hypersphere. Read more about pseudoscopes on this website.

How?
Find out how to make a pseudoscope for less than $10 (USD).

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