An interesting but condensed study of the relation of perception to movement and emotion. 'This world is a world in which we have to act, and our perceptions generally and our perception of space and time especially, are dependent on motor factors deeply embedded in our organization and the emotional and libidinous factors which are a no less important part of this organization'. Thus speed becomes the expression of repressed sadistic tendencies and a patient would see the analyst as it were in the far distance, when his attitude to the analyst became negative. Or again a patient may seek escape from his aggressiveness by experiencing the present as if it were the past, just as in other cases he may experience it as unreal. Various disorders of spatial perception may depend upon disturbances of the vestibular apparatus or upon the muscle tonus of the body, these tonic attitudes of the body being at bottom in some cases 'attitudes of the individual towards the world'.