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As long as all the motion-detectors are in balance with each other, you do not perceive any motion.When strongly stimulated by motion in a particular direction, the subset of motion detectors that respond to that motion become fatigued.Starting with that in mind, at least 1977 or earlier, I rigged up a way to make the original single spiral.Since the rate of the spiral had to change as it got nearer the center.Every time we stopped walking, it seemed that everything I looked at was receding from me.This effect was described in the early 19th century by R.At some stage I enlarged the disc with three zones to almost four feet and have used in talks at Harvard, UCLA, etc.Also was on That's Incredible, Omni the New Frontier program, Bill Nye the Science Guy and many more with the Tri-Zonal Space Warper and other optical illusions, and some of my magic.
He sent me several original newspaper articles describing his work including his 3-zone spiral which he calls the "Tri-Zonal Space Warper".
I drew the spiral with the aid of a screw cutting metal lathe.
A pen on an arm was held against the face plate, and descended rapidly at first and then gradually slowed down as in got nearer the center.
This article gives a physiological explanation: The brain has separate motion detectors for different directions of motion.
The motion detectors produce a stronger signal when there is motion and a weaker (but non-zero) signal when there is no motion.
In 1935, the artist Marcel Duchamp produced a set of 12 rotating optical illusions called Rotoreliefs.