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In this activity, learners will create an optical illusion top. Learners will explore color mixing, physics and design through this activity.

During this hands-on activity, learners are briefly exposed to moviemaking and animation, when they create their own thaumatropes.

Design and create an optical illusion toy that makes two pictures appear to become one. This is called a thaumatrope and will allow the learner to investigate the phenomenon of persistence of vision.

This activity is designed to accompany the PBS documentary about African-American chemist "Percy Julian: Forgotten Genius." Learners look through two cups with small holes in them to simulate what it'