Reopening July 1! What to expect
When the disk is spun, the colors you see are illusions. This effect was popularized in 1894 by toymaker C. E. Benham, who called his spinning disk an “artificial spectrum top."
Where: Bechtel Gallery 3: Seeing & Reflections
Stare at a bird’s eye for 30 seconds, then look into the empty cage. You’ll see a ghostly bird—of a very different color—inside the cage
(Embarcadero at Green Street)
San Francisco, CA 94111
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