'Fun' fact. My mother took the door off of my bedroom when I was a kid. Straight up had no door because how dare I have privacy. This being after she read my journal and found out I was gay. Lovely woman, her. Can't die faster.
Property is a social construct. It's just a way for all of us to make sense of living with each other.
The kid owned that door through a consensus, just as you own your things, even as an adult. If that was an illusion, so is all your property.
Point is, don't be a dick.