Benham Disc

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 …

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Count the Dots

For this exercise, all you have to do is count how many black dots you see. If you think you’ve experienced some kind of electronic perception manipulation, try printing the previous page, look at the graphic on paper, and see if you get similar results … What’s going on? David Hewson in Australia reported that …

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