From what I remember of this, it felt very powerful, strange, and strangely rational.
I believe the concept was that of the universe and objects and phenomena being the actual expressions of things such as thinking or of a body. That your veins exist because they are the physical expression in the world of this consciousness being.
That the entire universe is built on the disassociated identities of the universe taking on form as humans. The idea is that this is all consciousness but there are parts that have disassociated from it and parts that have not (chairs, beds, floors, walls, etc).
The best analogy that taught me so much about this philosophy is imagining our conscious experience as an airplane dashboard.
There's dials that represent true reality but if there's no windows or way to see it, those dials are all you have. We confuse the dashboard for true reality.
This is the mistake of Physicalism.