Duchamp Descending a Staircase' Life Magazine 1952 by Eliot Elisofon
This image above was part of a 10-page spread in LIFE profiling Duchamp. ("Dada's Daddy," April 28, 1952). It would have been taken with the camera placed on a tripod on a bulb setting. Each time Duchamp took a step Elisdon set off a flash or strobe light - creating a faint impression of Duchamp on the negative.