From Marcel Duchamp’s texticle on shop windows (Neuilly, 1913):
`The question of shop windows..
To undergo the interrogation of shop windows..
The exigency of the shop window..
The shop window proof of the existence of the outside world..
When one undergoes the examination of the shop window, one also pronounces one’s own sentence. In fact, one’s choice is “round trip”. From the demands of the shop windows, from the inevitable response to shop windows, my choice is determined. No obstinacy, ad absurdum, of hiding the coition through a glass pane with one or many objects of the shop window. The penalty consists in cutting the pane and in feeling regret as soon as possession is consummated. Q.E.D.’