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 & Listening
Step into this mobile camera obscura and never see the light the same way again. A small lens in the ceiling captures the scene around the visitor and projects a ghostly dreamlike movie on the table below.
Where: Gallery 5: Outdoor Exhibits