Journey in TImeThis is the 50,000 year story of the Australian Aboriginal rock art of Arnhem Land. Aboriginal rock art, as practised in Arnhem Land, is the world's longest continuing art tradition. It is a tradition that is not merely decorative, but provides a "journey in time" a pictorial record of the longest surviving culture on earth. Occurring at thousands of different sites, and of many different styles, the rock paintings of this region date from at least