One result of them came quickly into the foreground of the newer view: the perception of movement is an independent experience which cannot be reduced to a simple seeing of a series of different positions.

A characteristic content of consciousness must be added to such a series of visual impressions.

The mere idea of succeeding phases of movement is not at all the original movement idea.

This is suggested first by the various illusions of movement.

We may believe that we perceive a movement where no actual changes of visual impressions occur.