The fourth dimension (2) 维度：数学漫步 1 4 2535595 0 Mathematician Ludwig Schläfli talks to us about objects in the fourth dimension and shows us a procession of regular polyhedra in dimension 4, strange objects with 24, 120 and even 600 faces! 15 https://image.tmdb.org/t/p/original/mQgxlIjEbAbcB8jB3Alnb5nxiZg.jpg 2008-08-08 2008-08-08 false 0 BBC One 2026-07-31 19:40:28 UNKNOWN NONE S01E04_四维空间.strm The fourth dimension (2)