The meaning of "Opening" is in how it teaches attention to accept a narrow world. At 0:01 the piano does not announce a subject so much as begin a procedure. Repetition becomes discipline: listen again, notice the angle, feel the change, stay inside the frame.

That is why the later releases matter. The drops around 0:39 and 2:17 do not free the listener; they prove that change can happen without escape. The lift at 3:36 and the release at 5:43 make the system feel beautiful and binding at once. By the terminal silence after 7:13, the piece has made a quiet argument: an opening can be less a doorway than a way of learning the walls.