At the top right-hand corner a jolly young lad comes popping out of his house. As he rushes downstairs he loses his special quality and takes his place in a pattern of flat, grey, white and black fellow-shapes. Towards the left and upwards these become simplified into lozenges. The dimension of depth is achieved by the combination of three diamonds which give the impression of a cube. The cube is joined on to the house from which the boy emerges. The floor of a terrace is laid with the same familiar pattern of diamond-shaped tiles. The hilly landscape at the top is intended to display the upmost three-dimensional realism, while the periodic pattern at the lower part of the picture shows the greatest possible amount of two-dimensional restriction of freedom.