books.google.fr - Felix Klein, a great geometer of the nineteenth century, rediscovered an idea from Hindu mythology in mathematics: the heaven of Indra in which the whole Universe was mirrored in each pearl in a net of pearls. Practically impossible to represent by hand, this idea barely existed outside the imagination,...http://books.google.fr/books/about/Indra_s_Pearls.html?hl=fr&id=kC5kdUirHHoC&utm_source=gb-gplus-shareIndra's Pearls
