For me, the theosophical notion of multiple planes of existence is fascinating and thought provoking, but also very challenging to the rational mind. Perhaps "rational" is not the right term. It may be better to say that the notion of other planes of reality is challenging to a modern mentality overawed by the success and prestige of science. Accordingly, if the planes of theosophy are scientifically plausible, then the modern mentality is comfortable with them. However, if science deems…