Research on rock art conducted during the last several decades has shown the skill and knowledge demonstrated by the painters, engravers and sculptors who executed the motifs on rock surfaces and supports. Some motif sets required their creators to acquire a strong graphic command while workmanship techniques have very often proved to be more complex than previously assumed, including for remote periods. It also appears that the motifs have been placed according to specific criteria in connection with spatial orientation or support shape, for instance. The aim of this volume is to question...