Certainly neo-Platonism, Plotinus and Porphyry and that school are psychedelic philosophers. Their idea of an ascending hierarchy of more and more rarefied states is a sophisticated presentation of the shamanic cosmology, which is the cosmology that one experientially discovers when they involve themselves with psychedelics.
Terence McKennaWhen we free ourselves we are not freed into a void. When we free ourselves we are freed into a dimension in which Art is an obligation.
Terence McKennaWhat is needed is a spirit of boundary dissolution, between individuals, between classes, sexual orientations, rich and poor, man and woman, intellectual and feeling toned types. If this can happen, then we will make a new world. And if this doesn't happen, nature is fairly pitiless and has a place for us in the shale of this planet, where so many have preceded us.
Terence McKenna