The spectator experiences the phenomenon of transmutation; through the change from inert matter into a work of art, an actual transubstantiation has taken place... All in all, the creative act is not performed by the artist alone; the spectator brings the work into contact with the external world by deciphering and interpreting its inner qualifications and thus adds his contribution to the creative act.

The Writings of Marcel Duchamp (Marchand du Sel) e.d. Michel Sanouille and Elmer Peterson, New York 1973, pp. 139-140