The tradition and methods of Indian cliff painting gradually evolved throughout many thousands of years - there are multiple locations found with prehistoric art. The early caves included overhanging rock decorated with rock-cut art and the use of natural caves during the Mesolithic period (6000 BCE). Their use has continued in some areas into historic times. The Rock Shelters of Bhimbetka are on the edge of the Deccan Plateau where deep erosion has left huge sandstone outcrops. The many caves and grottos found there contain primitive tools and decorative rock paintings that reflect the ancient tradition of human interaction with their landscape, an interaction that continues to this day.