This peculiarity of knowledge is what I call its unexhaustive character.

This character may be metaphorically described by the statement that nature as perceived always has a ragged edge.

For example, there is a world beyond the room to which our sight is confined known to us as completing the space-relations of the entities discerned within the room.

The junction of the interior world of the room with the exterior world beyond is never sharp.

Sounds and subtler factors disclosed in sense-awareness float in from the outside.