Dimensions by Jos Leys - Étienne Ghys - Aurélien Alvarez
Chapter 3: Dimension four (pt. 1)
Mathematician Ludwig Schläfli talks about objects that live in the fourth dimension and shows a parade of four-dimensional polytopes, strange objects with 24, 120 and even 600 faces !
More detailed explanation of Ch 3: http://www.dimensions-math.org/Dim_CH3_E.htm
Visit the site to watch online or download free: http://www.dimensions-math.org/
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