Two studies on one sheet. On the left is an axonometry of a cube. Next to it are drawn all the diagonal lines. Broken lines indicate the center axes of each plane. On the right is also an axonometry of a cube, divided into behind equal smaller cubes. These center lines are shown broken. Four additional lines are also drawn; from the center of the front plane to the center below the right plane; from the center of the right plane to the center above the back plane; from the center of the back plane to the center above the left plane and from the center of the left plane to the center below the front plane.