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In this engineering design challenge, learners animate a facial expression and make a machine (zoetrope) that plays the animation back.

In this activity, learners create a traditional Mexican noisemaker (a matraca) using cardboard, craft sticks, and a wooden dowel.

In this activity, learners build a figure that moves and "comes to life" when they pull its string.

In this activity, learners construct a device that allows them to view 2-D images in 3-D.