photodrome /(fō"tō̇*drōm)/

pho·to·drome

photodrome

n.
  1. An apparatus consisting of a large wheel with spokes, which when turning very rapidly is illuminated by momentary flashes of light passing through slits in a rotating disk. By properly timing the succession of flashes the wheel is made to appear to be motionless, or to rotate more or less slowly in either direction. (Physics)