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In this activity, learners investigate color vision as well as plan and conduct their own experiments.

In this activity, learners discuss and investigate how cameras, telescopes, and their own eyes use light in similar ways.

In this activity (12th on the page), learners investigate their ability to discriminate (see) different colors.

In this activity, learners investigate visual perception as well as plan and conduct their own experiments.

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