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Lie Algebra tree. Original by M. Koshka

Old reel rating. Original by M. Bamiki

Femme a la Main Levee. Lithography by Le Corbusier

Le Corbusier: Femme a la Main Levee, Lithograph, 1954. The English translation of the title is "Woman with the raised hand", although there is a pun because "a la main levee" means informally, as for a first draft or something you do carelessly.

Portrait of Joseph Leonard Walsh

Joseph Leonard Walsh (September 21, 1895 to December 10, 1973) Perkins Professor of Mathematics, Devoted 53 years of his life to Harvard.