From La Cocotologie: Notes pour un Traité by Miguel de Unamuno (Paris, 1946).
A detailed philosophical essay on origami, with engravings by Gérard Angiolini.
(Translated into French, after the 1902 Spanish original in Unamuno’s Amor y Pedagogia, a satirical novel on the excesses of positivism.)

http://en.wikipedia.org/wiki/Miguel_de_Unamuno