And some look like they were used to channel rainwater for some purpose. Fool may be onto something that at least some types of cup marks were made by women.
Then again, we have no idea what role women played in these ancient societies because we know virtually nothing about these societies.
You read things that make you wonder. I remember reading once about skeletons found in Indochina 6 to 7 feet tall who inhabited the region before the current folk. Who were they? Who were the red-haired Caucasian mummies found in China who wore double-peaked hats? Nothing like them in Europe. Who were they? Where did they come from and why did they settle where they did? Or were they always there?
The Sino-Japanese kanji (ideogram) for "east" is "higashi" or "to" (pronounced something like our "toe"). It looks like this:
It is the same "to" used in "Tokyo" for example. It represents the sun rising behind a tree. Again, this indicates an ancient people marking the sunrise with a tree or rock or other auspicious object which would indicate how ancient some of the kanji ideograms must be. Who actually developed the original hieroglyphs that became the kanji system and when?