Phys.org reports that stenciled rock art has been identified in South Africa, which is known for rock art painted with brushes and fingers. "I wasn't entirely sure what I was looking at for a while," said David Pearce of the University of the Witwatersrand. "Then they popped into focus, a bit like optical illusions do," he explained. The two human-like figures were discovered in the La Rochelle rock shelter in eastern South Africa, where few paintings have been found on the region's steep cliffs. Pearce said that brush-painted images of hartebeest, eland, and humanoid beings had previously been identified in...