sentences: )The second is an in-camera effect, achieved either by running the camera itself backwards or by turning the camera upside down.Most cameras are directly capable of running the film backwards (spooling from bottom to top rather than from top to bottom) and those that cannot can mostly be adapted into doing so by the simple expedient of rewiring the electric motor, switching its polarity (for DC motors) or changing over any two of its phases (for synchronous three-phase motors).