Jean Dubuffet's *Banque de l'hourloupe* is a limited-edition portfolio published by Editions Alecto Ltd., London, representing a significant example of the artist's celebrated "L'Hourloupe" cycle, his iconic visual language of interlocking, cell-like forms. This rare artist's proof, numbered AP 3/30 from an edition of 350, features individually numbered and titled sheets, each annotated on the reverse. Housed in its original black canvas-covered portfolio with screenprinted title on the cover and spine, the work remains in very good condition.