- Four-Space Visualization of 4D Objects - Mathematical and computer programming oriented approach. Discusses wireframe rendering and ray-tracing.
- 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.
- 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.
- HyperCube by Harmen - A short introduction to the fourth dimension, plus a hypercube java applet game.
- Hypercube's homepage - Philosophy, math, and cosmology related to the fourth dimension.
- Hyperspace Structures - Exploring the Fourth Dimension - Introduction to the hypercube, hyper-torus, and approximation to the hypersphere. Page includes mpeg movie clips to illustration the various objects.
- 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.
- Miscellaneous Mathematical Musings - Introduction to dimensions, multi-dimensional geometric units, and formulas for calculating higher-dimensional phenomena.
- 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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