| 1. | Fourth Dimension: Tetraspace | | | (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 |
| 2. | 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. www.hyperdimensia.com |
| 3. | HyperCube by Harmen | | | A short introduction to the fourth dimension, plus a hypercube java applet game. www1.tip.nl |
| 4. | Hypercube's homepage | | | Philosophy, math, and cosmology related to the fourth dimension. www.geocities.com |
| 5. | Miscellaneous Mathematical Musings | | | Introduction to dimensions, multi-dimensional geometric units, and formulas for calculating higher-dimensional phenomena www.geocities.com |
| 6. | Thinking 4-d | | | Focuses on helping the reader to conceive of the fourth spatial dimension, and in particular discusses hypercubes and hyperspheres. www.geocities.com |
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