Sculptures, cave paintings, rock paintings and petroglyphs from the Upper Paleolithic dating to roughly 40,000 years ago have been found, but the precise meaning of such art is often disputed because so little is known about the cultures that produced them. The oldest art objects in the world—a series of tiny, drilled snail shells about 75,000 years old—were discovered in a South African cave.[26] Containers that may have been used to hold paints have been found dating as far back as 100,000 years.[27] Etched shells by Homo erectus from 430,000 and 540,000 years ago were discovered in 2014