A couple of years ago, I often thought about whether everything that enters
the body must leave, and everything that leaves the body must never enter again.
I wanted to construct a law, so I pondered over various situations. All that
enters and leaves our orifices. All that could. What could stay? We could pin
things in place or attach them surgically, but these usually do not enter
organically. You are opened up for them and they are placed. I concerned myself
mainly with available entrances, routes, and exits.