These are all subjective changes, changes in the way your mind perceives/interprets the wall, not changes in the wall itself. And, as I said, I agree that you can experience annica of your mindstream.
Matt J wrote:
So where is the line between the mind-stream and the wall? Does one ever experience the wall itself (i.e. beyond our seeing, hearing, touching, etc.)?
Here's my take, fwiw. (Not my attempt to paraphrase a Buddhist take.)
First, there is no "wall itself." There is *something* that exists which mind interprets as: wall. But that's just an interpretation of mind, a concept. So there is no wall-itself to be experienced.
If you move down to the *something* that does exist ... this something cannot be experienced other than through the senses, which is mind.
So: "The wall" is a kind of co-creation of mind and the something that does exist. Without mind there would be no wall; without the something there would be nothing for mind to interpret (as wall). You need both for the wall to come into (relative) being.