It's amazing to put yourself in the mind of a member of one of these nomadic peoples 2500 years ago, having only ever known the traditions of your tribe, living out your days tracking and catching wild game beneath the desert sun – and then deciding to do something new. Building on the knowledge of your most experienced hunters to design and engineer a modification to your environment that will permanently change the way your society hunts.
I think the markets might have been more in control, at least within the community. You don't just keep it all to yourself in a tribe. (But actually I have no Idea how big these groups where and how abstract and complex their power structures)
...and become artists. After consuming some wild mushrooms they decided to create pictures nobody would be able to see in full. A true innovative art project that has been visited since then by different tribes. It finally become a local event spot for the full moon "let's fuck with the guys in the future" party.
There's no way to tell how these were thought of. Maybe it happened the way you declared, maybe it happened as a very iterative process of refinement over thousands of years.
I can imagine it starting off as noticing the the Antelope follow natural ridges in the land and lying in wait at the end of a ridge to ambush the animals. Later they build artificial ridges and then low walls. Finally, they add the kill pits and iterate on the wall layouts to produce the sophisticated guiding shapes shown in the article. Interesting stuff.
Or it could have started by building a kill pit at the end of a natural ridge/wall/stream, and using dozens of men to force the antelopes along the path to the pit. Then someone said "wait, if we build another barrier on the other side, we could do this with fewer men...
But either way, I doubt they were just chasing antelopes across flat land and one dude said "Eureka! I've got it!"
Truly these were the first hackers.