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This icosahedron is constructed as a stereopair, with the red image designed to be viewed with your left eye and the blue image with your right. (You'll need a pair of red/blue 3-D glasses or goggles to appreciate the effect.) The Picture, Horizon, and Ground points control the perspective projection of the 3-D model, using Cathi Sanders's mechanical drawing techniques (see Perspective Drawing with The Geometer's Sketchpad).
The Right and Left points control the degree of disparity between the projected stereo images. Dragging them far apart simulates the binocular vision of a rhinoceros, and dragging them close together the vision of a mouse. When the two points are coincident, the stereopair reduces to a monocular projection.