Buenos Aires, 1918.
The words forming this work’s title are inscribed (in French) on a strip of metal glued across the composition’s approximate center and appearing to invite viewers to look through a lens haloed by concentric circles and mounted between two panes of glass. Peering through the convex lens “for almost an hour” is supposed to have a hallucinatory effect as the view is dwarfed, flipped, and otherwise distorted. Duchamp delighted in the fact that the glass shattered while being transported, welcoming the mechanics of chance into the work. source 
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