polyeder

Choppers of Oldowan culture, made between 2,6 and 1,7 million years before our era. Ethopia. Wiki

The first stone tools of mankind were found in Oldowan, Tanzania, used by ancient hominini. Our ancestors did beat with hard stones on softer ones, in different directions and angles. The lithic flakes were useful too, you could split wood or use it on bones to get to the marrow.