The stone pushers wanted to mark their places on and in the land. Exactly why they felt a given place needed marking, I don't know. EXACTLY what they hoped to accomplish by marking--dividing, covering--I don't know.
But I do think the act of marking, with permanent stones or rock art, meant they were no longer in a "state of nature." They had become technologically oriented manipulators and creators (technicians), as opposed to psychologically oriented finders and petitioners (shamans).
Perhaps this is trivially obvious. Thanks for the chance to spout off.