This is a map Ken Wilber created early in his work, that appears to influence his work even today. Wilber's vision is that of a unification of different traditions into a universal ground, a transcendent divine source. It is a monistic vision.
"Wilber believes that the mystical traditions of the world provide access to, and knowledge of, a transcendental reality which is perennial, being the same throughout all times and cultures. This proposition underlies the whole of his conceptual edifice, and is an unquestioned assumption."
"One of Wilber's main interests is in mapping what he calls the "neo-perennial philosophy", an integration of some of the views of mysticism typified by Aldous Huxley's The Perennial Philosophy with an account of cosmic evolution akin to that of the Indian mystic Sri Aurobindo. He rejects most of the tenets of Perennialism and the associated anti-evolutionary view of history as a regression from past ages or yugas. Instead, he embraces a more traditionally Western notion of the great chain of being. As in the work of Jean Gebser, this great chain (or "nest") is ever-present while relatively unfolding throughout this material manifestation.."