Ed Pegg Jr., May 1, 2007
Many interactive puzzles are available. For example, each of the dots within the Orchard Planting Problem can be moved around on the grid.
George Hart, "4D Polytopes and 3D Models of Them," http://www.cs.sunysb.edu/~cse125/notes/08-4D-Forms.ppt.
George Hart, "4D Polytope Projection Models by 3D Printing," May 3, 2002. http://www.georgehart.com/hyperspace/hart-120-cell.html.
Paul Hildebrandt, "Zome-inspired Sculpture," http://www.lkl.ac.uk/bridges/Zome-Hildebrandt.pdf.
Roice Nelson, "Explore the 120-Cell," July 1, 2006. http://www.gravitation3d.com/120cell/.
Mark Newbold, "Hyperspace Star Polytope Slicer," Feb 1, 2003. http://www.dogfeathers.com/java/hyperstar.html.
Fritz Obermeyer, "Jenn 3d," http://www.math.cmu.edu/~fho/jenn/.
Marc Pelletier, "Paul Donchian, Modeler of Higher Dimensions," Fields Institute Presentation, February 15, 2002. http://www.fields.utoronto.ca/audio/01-02/sculpture/pelletier/.
Ivars Petersen, "Math Trek: Quark Park," Nov 11, 2006. http://www.sciencenews.org/articles/20061111/mathtrek.asp.
Miodrag Sremcevic, Radmila Sazdanovic, and Srdjan Vukmirovic, "Tessellations of the Euclidean, Elliptic and Hyperbolic Plane," Wolfram Information Center, March 23, 2003. http://library.wolfram.com/infocenter/MathSource/4540/.
John Stillwell, "The Story of the 120-Cell," Notices of the AMS, Jan 2001. http://www.ams.org/notices/200101/fea-stillwell.pdf.
Jeff Weeks, Curved Spaces 3, Dec 2006. http://www.geometrygames.org/CurvedSpaces/.
Andrew Weimholt, "120-Cell Foldout," http://www.weimholt.com/andrew/120.html.
Comments are welcome. Please send comments to Ed Pegg Jr. at email@example.com.
Ed Pegg Jr. is the webmaster of mathpuzzle.com. He works at Wolfram Research, Inc. as an associate editor of MathWorld. He is also a math consultant for the TV show Numb3rs.