Photograph and interactive Doppler radar sculpture, by Steve Mann, 1985.
TimeWarp, gelatin-silver print, 1985, home-made slit-shutter camera, 11x9 in; depicts speed-sensing clock sculpture that advances in exact proportion to the distance traveled by persons approaching it (1 minute per foot), as sensed by a Doppler radar homodyne (lock-in amplifier) system feeding a synchronous clock motor with the Doppler radar return from people walking toward the clock. When people stop moving the clock's hands stop turning. The faster people move, the faster the clock's hands turn.
The photograph captures also the concept of shearing the spacetime continuum.
Exhibited as part of Microseconds and Millennia at Olga Korper Gallery, Toronto Ontario, 2000 Jul. 6, 2000 To Aug. 16
Caption I had written for the sculpture in 1990:
The hurrier you go the aheader I get.
The hurrier you go the aheader I get
But when you wait in the rain you're gonna get wet
'Cause when you're waiting my hands stand still
Time is a concept you just can't kill
Steve Mann, 1990