This was one of the first books I read at Banyen Books as I began my quest about 40-years ago; that and a little black book called The Impersonal Self.
They've always stayed with me even as a Christian Gnostic. I see the Dualism as similar as is the Tao similar to the unknown God of the gnostic tradition.
I see all the rabbit holes as similar to all the theme parks within WestWorld.