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

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

In this story time program, young learners listen to the Dr.

In this activity, learners will create an optical illusion top. Learners will explore color mixing, physics and design through this activity.

This activity (on page 2 of the PDF under SciGirls Activity: Colorblind Dogs) is a full inquiry investigation into dogs' ability (or inability) to see color.

In this activity, learners investigate the sense of sight and develop and conduct their own experiments.

In this activity, learners calculate the width (horizontal diameter) of the blind spot on their retina. Learners make a blind spot tester using a piece of notebook paper.

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

Spin a short piece of PVC pipe that's been marked up, and watch a triangle appear. Enjoy this optical illusion from the Exploratorium's Science Snack series.