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Interestingly, the View-Masters that many of us played with as children are an example of viewing stereo images.

3D films also take advantage of this illusion. The anaglyph is an image made up of two views: one red and one blue. When viewers see the anaglyph through special 3D glasses (with a red filter for one eye and a blue filter for the other), they can perceive depth in the image.

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