Doors

Suppose you didnt know what a door is. That it opens, for
instance. It would seem a different part of the wall, thinner,
more resonant. A decorative rectangle set in the wall, an
embodiment of some geometrical mystery like the Golden
Section. It would seem tantalizing to someone trapped in the
room--a perverse, mean tease: the wall is thin here, soft, but
still unpassable. How little it would take to get through the
wall, yet you cant.

Suppose you didnt know what a door is, that it can open, that
its resistance defines the zone of least resistance, but that zone
requires a deft use of something learned, a knack, a skill:
twisting the knob and pulling. Or pushing. Even if you got as
far as turning and pulling, if the door were the kind that
opened outward, you'd still never guess, never get through.

Suppose all round us there are things like doors in things like
walls and we never knew.

--Robert Kelly, from this