Marcel Duchamp
[Artist, b. 1887, Blainville, France, d. 1968, Neilly-sur-Seine, France.]

 You know exactly what I think of photography. I would like to see it make people despise painting until something else will make photography unbearable. (In a letter to Alfred Stieglitz) 
 It’s the viewer that makes the work. 
 Unless a picture shocks, it is nothing. 
 Without glue—Make an assembly of ‘readymades’ balanced one on top of the other and photograph them. (Proposal)