This was a book I read back in the '80s I believe. Sort of a post-apocalypse setting in the beginning. It involved a person going into a desert as a rite of passage. She was subjected to hallucinations until a visitor from a colony (comet based I believe?) arrived and she realized it was all in her mind. It ended with the revelation that humanity had created machines (towers) that allowed them to use telekinesis, however the violence that followed caused them to bury the towers in mountains and create the rite of passage as a way of killing off people who failed to learn control. I recall the man "died" in a fight towards the end but was brought back.
For some reason the title "Wandering Star" comes to mind but I think that is wrong.