Even with the reduced size and resolution of this short clip, you can probably see the intended effects.
- Watch the disc. Describe what you see … do you see shapes? Colors?
- As the rotation slows, do the shapes and colors change? How so?
- If others are watching at the same time … compare what you see with what they see.
- What does this do to the conventional wisdom that “seeing is believing”?
- Where do the “rings” and “colors” exist? (They’re ‘manufactured’ by your nervous system.)
- This suggests that “color is in the eye of the beholder.” What does this imply for all adjectives and descriptions?
- View more visual misperception demonstrations by neurobiologist Christof Koch here.
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Here is a visual explanation for the effect by Blue Man Group, from “Inside the Tube”:
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Here is a basic explanation for the effect: http://faculty.washington.edu/chudler/benham.html
Here is another: http://www.exploratorium.edu/snacks/benhams_disk/index.html