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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.
Kaleidoscope
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In this activity, learners build inexpensive kaleidoscopes using transparency paper and foil (instead of mirrors).
Periscope
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In this activity, learners construct a device that allows them to look over ledges or around corners.
Spinning Illusions
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In this activity, learners construct three optical illusion toys to examine how our brains play tricks on what we see.