Prehistoric technology Ground and polished stone tools continued to be created and used during the Neolithic period. Numeric record keeping evolved from a system of counting using small clay tokens that began in Sumer about 8000 BC. The Stone Age developed into the Bronze Age after the Neolithic Revolution. The Neolithic Revolution involved radical changes in agricultural technology which included development of agriculture, animal domestication, and the adoption of permanent settlements. The Bronze Age is characterised by metal smelting of copper and its alloy bronze, an alloy of tin and copper, to create implements and weapons. Polished stone tools continued to be
Inside the Neolithic Mind share in the ability to enter into altered states of consciousness, in which they experience entoptic phenomenon, which the authors discern as a three-stage process leading to visionary experiences. Arguing that such altered experiences have provided the background to religious beliefs and some artistic creativity throughout human history, they focus their attention on the Neolithic, or "New Stone Age" period, when across Europe, communities abandoned their nomadic hunter-gatherer lifestyles and settled to become sedentary agriculturalists. Adopting case studies from the opposite ends of Neolithic Europe, Lewis-Williams and Pearce discuss the archaeological evidence from both the Near East – including such