Le Corbusier was an eloquent critic of the finely crafted, hand-made furniture, made with rare and exotic woods, inlays and coverings, presented at the 1925 Exposition of Decorative Arts. Following his usual method, Le Corbusier first wrote a book with his theories of furniture, complete with memorable slogans. In his 1925 book "L'Art Décoratif d'aujourd'hui", he called for furniture that used inexpensive materials and could be mass-produced. Le Corbusier described three different furniture types: "type-needs", "type-furniture", and "human-limb objects". He defined human-limb objects as: "Extensions of our limbs and adapted to human functions that are type-needs and type-functions, therefore type-objects and type-furniture. The human-limb object is a docile servant. A good servant is discreet and self-effacing in order to leave his master free. Certainly, works of art are tools, beautiful tools. And long live the good taste manifested by choice, subtlety, proportion, and harmony". He further declared: "Chairs are architecture, sofas are bourgeois".