a pebble or a box

"A pebble or a box simply is where it is and stops where it stops. Living things, by contrast, have their boundaries as part of themselves, as part of the bodies which they are... A body with this kind of boundary structure is not simply divisible into inner and outer; it is, through its relation to its boundary, both directed outo beyond the body that it is and back into it again."

Marjorie Grene