Marcel Duchamp, ‘Étant donnés’ 1966 (via Dangerous Minds)
Wiki: “Duchamp worked secretly on the piece from 1946 to 1966 in his Greenwich Village studio while even his closest friends thought he had abandoned art. His wife, Alexina (Teeny), was his sole confidante during most of its construction.
It is made of an old wooden door, bricks, velvet, twigs, a female form made of leather, glass, linoleum, and an electric motor. Duchamp prepared a “Manual of Instructions” in a 4-ring binder explaining and illustrating how to assemble and disassemble the piece.”
I love when art has a manual