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Stereoscope
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In this activity, learners construct a device that allows them to view 2-D images in 3-D.
Mini Zoetrope
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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.
Periscope
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In this activity, learners construct a device that allows them to look over ledges or around corners.