| Because of their composition and the coexistence in them of meanders and tectiforms they differ from chimpanzee drawings, which are in many other ways a comparable phenomenon. |
| Even in the palaeolithic periods symbols abound such as cup markings, tectiforms, penniforms, groups of dots, rectangles, lattice designs, symbolic vulvas, and so on. |
| The tectiforms reproduce in a remarkable manner the simple shelters, tents, and huts in use today among primitive and nomadic races in various parts of the world. |
