sounds can start to dissolve. For example, an airplane may fly overhead, and you hear an airplane-flying-overhead sound. Except you don’t necessarily think, “Oh, an airplane.” You’re so immersed in the texture of the sound that you may not immediately think, “Oh, an anything.” It’s just pure sound, unattached to the idea of a particular, concrete object. I guess it’s what an airplane would sound like to somebody from a culture that didn’t have airplanes or to an alien from a civilization so advanced that its aircraft didn’t make noise. It would just be sound—not the sound of anything.