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In this activity about light and refraction, learners discover how a lens creates an image that hangs in midair.

In this activity, learners construct three optical illusion toys to examine how our brains play tricks on what we see.

How can you make one shade of gray look like two? By putting it against two different color backgrounds! This activity allows learners to perform this sleight of hand very easily.

In this activity, learners make a Benham Top to explore visual illusions and optics.

In this artistic activity, learners blow up a smaller picture into a larger one, by using a grid.