Early Acheulian & Developed OldowanB / s)oldef-hrbiffig65

Two lava bifaces. Site EF-HR, Upper Middle Bed II, Olduvai Gorge (c. 1.3 MYA).

In the object (above) it appears to be the 90° rotation view that actually bears the most pleasing symmetries.

Photo © Leakey, M. (1971). Olduvai Gorge, Vol. 3. Cambridge: At the University Press: fig. 65. (yellow highlight added)