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In this simple activity, learners investigate refraction by placing a picture of an arrow behind a glass of water.

In this fun and interactive online exhibit, the straight lines of a tile wall appear to curve. The learner moves the rows of tiles and changes the color of the grout to achieve the intriguing effect.

We don't normally view people upside down and so our brains aren't accustomed to it.

Known as the waterfall effect, this activity demonstrates adaptation in our visual system.

In this optics activity, learners conduct an experiment to find out why two eyes are better than one!