Thus we have reached the exact counterpart of our results when we analyzed the perception of depth.

We see actual depth in the pictures, and yet we are every instant aware that it is not real depth and that the persons are not really plastic.
It is only a suggestion of depth, a depth created by our own activity, but not actually seen, because essential conditions for the true perception of depth are lacking.

Now we find that the movement too is perceived but that the eye does not receive the impressions of true movement.

It is only a suggestion of movement, and the idea of motion is to a high degree the product of our own reaction.

_Depth and movement alike come to us in the moving picture world, not as hard facts but as a mixture of fact and symbol.