They form the basis of all later representation and expression. Some of these Deep Structures are about position and location. These include actions of covering, of putting inside, of placing and finding. In this way, children build up knowledge of points in space, of inside and outside relations, enclosure, hollowness, boundary, proximal and distal relations. Other Deep Structures are about movement.
Infants make important discoveries about changes of state and changes of position.
They explore ascending and descending flight, going through and going round. In this way, children form an understanding about the causal relations of events, why objects are set in motion and what sets people in motion. They also form an understanding of angular momentum and angular variation, of the beginnings and ends of routes, processes and of stories. With further experiences, and with periodic revolutions in cognition, these Deep Structures about events and objects are continuously revised. They are combined to form more complex structural principles of right-angular attachment.