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That's a great one. Had not seen that before. Much more fun to watch than the spinning tires tacked together at an angle which do a similar changing thing. I wonder how many old tire places used that trick for their signs. I tried to find an example on the web but could not. Anyone have advanced googling skills? See if you can find an image of one of those old tire shop signs that was made by fastening two tires together at at an angle, then rotating them around an axis. It is the same kind of rotation illusion which appears to go in either direction.

-Klueped and Scrounged

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"A and B are the same shade of gray (same color)! Believe it or not... "

Hard to believe, but it is true. Shows how context is almost everything and how comparisons of perceptions, either instantly or serially, is highly problematic. I am reminded of the famous Land experiments.

"Edwin Land and color vision
The now-classic experiments on color vision begun in the 1950s by Land are not only a fine example of exploratory experimentation at the frontier between physics and biology, they also have a direct bearing on the theoretical content of Goethe's Theory of Colors. Land's research began with a simple experiment using two black-and-white transparencies of the same colored scene. The first transparency, the "long record," was taken through a filter that passed only long-wavelength light. The second, the "short record," was taken through a filter that passed only short wavelengths. The two records differed only in the lightness or darkness of corresponding points; neither had any color. The transparencies were then projected onto a screen, directly on top of one another, using a beam of light from the red part of the spectrum for the long record and a beam of incandescent light for the short record. According to the classical color theory based on the work of Newton, Thomas Young, James Clerk Maxwell, and Hermann von Helmholtz, the image on the screen could only be some shade of pink. What the observer saw, however, was an image brilliantly and diversely colored, almost like the original scene."

-Klippednshorn

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