In upper levels of the site, it becomes apparent that the people of Çatalhöyük were gaining skills in agriculture and the domestication of animals. Female figurines have been found within bins used for storage of cereals, such as wheat and barley, and the figurines are presumed to be of a deity protecting the grain. Peas were also grown, and almonds, pistachios, and fruit were harvested from trees in the surrounding hills. Sheep were domesticated and evidence suggests the beginning of cattle domestication as well. However, hunting continued to be a major source of food for the community. Pottery and obsidian tools appear to have been major industries; obsidian tools were probably both used and also traded for items such as Mediterranean sea shells and flint from Syria. There is also evidence that the settlement was one of the earliest places in the world to mine and smelt metal in the form of lead. Noting the lack of hierarchy and economic inequality, historian Murray Bookchin has argued that Çatalhöyük was an early example of anarcho-communism.