“Even in the palaeolithic periods symbols abound such as cup markings, tectiforms, penniforms, groups of dots, rectangles, lattice designs, symbolic vulvas, and so on.”

“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.”

“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.”