Working hard in the unforgiving fields of energy, matter and time can wear a feller down no end. Here's the thing: a being tends to identify with forms he puts lots of effort into. The harder you work the physics front, the less lively your imagination tends to become.

Shimrod and Bill are safe in a well-defined zone of solid reality, which is a good thing. So, Shim, no apologies needed for your bold assertions about the ineluctable dominance of the space-time continuum.

If you ever do find yourself three feet behind your head, however, don't let it panic you. Just find a safe spot to hang out until you feel better oriented. It can be extremely discomfiting to let go of an identity you have been hard-over locked into for some time.

Besides, if it turned out you were a spiritual entity using a body instead of a body scoffing at the idea of spiritual existence, just think of the awful consequences that discovery would entail!! You might have to be responsible for long, long chains of suffering and tribulation given and received over gawd knows how many lifetimes, or something like that. That would be too much for any ordinary mind to handle.

Smooth sailing, that's the ticket!