I'm currently reading "The Ever-Present Origin" by Gebser. If you are into Gebser you should read Ken Wilbur. Suggest "A Brief History of Everything". Wilbur is much better known than Gebser, even though he owes much of his thinking to Gebser.

If you want to read my take on the same topic, I predict where we are going in this article: https://medium.com/original-philosophy/a-brief-theory-of-everything-interobjective-ecologies-45d0a29cf9e0