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In this activity about light and perception, learners create pictures in thin air.

In this activity (posted on March 27, 2011), learners follow the steps to construct a mini zoetrope, a device that produces an illusion of action from a rapid succession of static pictures.

If you had a long tube with a 5 millimeter wide slit, would you see the entire Golden Gate Bridge?

In this activity, learners will make a thaumatrope, an old-fashioned optical illusion that dates back to the 1820s.