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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.
tetraspace.alkaline.org
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.
www.hyperdimensia.com
A short introduction to the fourth dimension, plus a hypercube java applet game.
www1.tip.nl
Philosophy, math, and cosmology related to the fourth dimension.
www.geocities.com
Miscellaneous Mathematical Musings
Introduction to dimensions, multi-dimensional geometric units, and formulas for calculating higher-dimensional phenomena.
www.geocities.com
Focuses on helping the reader to conceive of the fourth spatial dimension, and in particular discusses hypercubes and hyperspheres.
www.geocities.com
Four-Space Visualization of 4D Objects
Mathematical and computer programming oriented approach. Discusses wireframe rendering and ray-tracing.
stevehollasch.com
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.
www.hyperspace-travel.de