This is not going to be easy to describe. From its title you could guess that it was some weirdo's baseless pseudo-philosophical ramblings, and you wouldn't be far off. Ouspensky does a near adequate job of folding in (what was, at the time) cutting-edge science into a spiritual soup, but you could by no means call it scientific, more like fantasies on a scientific theme. Still, I would definitely recommend reading this for anyone interested in unusual ways of thinking, or anyone interested in writing sci-fi or fantasy novels with bizarre premises.