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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.
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.
Bring it into Focus
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In this activity (page 2 of PDF), learners play with a lens and a piece of paper to focus an image on the paper. Learners look at different things, and see how the lenses affect the image.