The spiral is a very old and widespread graphic symbol. It forms a dynamic system, which either contract or expand, the motion being either centripetal or centrifugal. Because of its similar shape to turbulences and whirlpools in liquids flowing downwards through an opening, such a symbol may indicate sinking into the ‘waters of death’. This could explain why such symbolic figures are often carved into boulders of prehistoric megalithic tombs. The double spiral connects both elements, contract/expand, into a unit. It can be seen as the ‘origin and decay’ and the reversibility of this process. The meaning of the triple spirals in prehistoric megalithic tombs can no longer be traced. The connection with the labyrinth also remains hypothetical, although the thought of a difficult way in and out again suggests a connection with the symbolism of dying and being reborn. (Biederman, 1992)