ptitza: These stones, as it turned out, can cause no less astonishment and trembling than more familiar objects of art. You hold a ruby in your hand and think that it was held by a swirling leg, an Australopithecus, well, let some later homo. Handwriting in 1.5 million years. Keep them very convenient, well in the hand, the center of gravity is placed correctly. There are tools as if adapted to a smaller hand, and there are - to a larger hand, made of different materials, some better made, some worse. You can imagine that the first homo held them, as today’s homo holds iPhones of different editions: "What do you have there? The monopoly? Thou! I have a biphas – a thing!"