The book – which was created for Swiss wallpaper manufacturer Salubra – features pop-up and pull-out sections, based on the architect’s approach to colour. A rare first edition of Le Corbusier’s 1931 interactive design guide Polychromie Architecturale: Die Farbenklaviaturen. The guide includes pockets with wallpaper samples and 12 pages dedicated to colour scales – complete with a paper slider.