Self and Not Self

Try this simple experiment before reading the following explanaton. Thar be spoliers there.

Step 1: Get a pen or pencil. Or anything else spear or rod-like you can poke things with.

Step 2: Hold this pen (or whatever you have) like you're going to poke something with it.

Step 3: Poke a lot of shit with it. Poke a pillow, then poke a wall.

Step 4: Notice how when you poke shit with your pen, you sort of have a feeling for the end you're poking shit with and not so much where you're actually touching it.

Step 5: Note how totally weird that is now that you've taken the time to think about it. I mean, it's just the tip of a  pen, and not an extension of yourself you should be able to feel despite the lack of nerves extending into it right? Well...