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- The 4D Web Page - - List of links to sites on people, books, art, java applets, games, and general information on the fourth dimension.
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- Fourth Dimension: Tetraspace - - A discussion of rotation, levitation, wheels, and bodies of water. Classification of "rotatopes" (cubes, spheres, and cylinders), and a Java applet to visualize projections and intersections of the shapes. Includes book reviews, a glossary, links, and a forum.
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- Hyper Dimensia - - Tutorial which aims to give readers an understanding of the fourth dimension by having them use a java applet to rotate a cube and a hypercube to see multiple views of the shapes at once.
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- HyperCube by Harmen - - A short introduction to the fourth dimension, plus a hypercube java applet game.
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- Hyperspace Travel - - Images and animations of a couple of four-dimensional objects, along with the math and source code used to produce them. Links to software to interactively visualize four-dimensional objects.
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- The 4th Dimension - - Visual and mathematical descriptions of higher dimensional objects, with Java applets for displaying and rotating images such as Steiner surfaces, Klein bottles, and minimal surfaces.
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- Thinking 4-d - - Focuses on helping the reader to conceive of the fourth spatial dimension, and in particular discusses hypercubes and hyperspheres.
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