The math content is best found in the book by Thomas F. Banchoff, Beyond the Third Dimension, Scientific American Library, New York, 1990.
The models were made using Robert Webb's Stella4D program.
Magnus J. Wenninger, Retired Teacher of Mathematics, St. John's Abbey, Collegeville MN
"Only after I myself made these 3D paper models of 4D polytopes did I come to better understand what is involved in the statement that these models are 3D 'pictures' of 4D objects. Thus making models is helpful in the learning process."