Weeks ago, I stumbled upon a homeless man who had many plastic bags with him.
It looked like he had gathered unwanted materials from the trash cans and decided that they worth keeping.
It was clear they are now his private property.
At first I thought it seemed rather silly to take all the trouble to gather and keep such worthless things. I believe he'd carry them with him whenever he needs to move around.

Suddenly, I realized something.
We are all like that too.

We love to gather, keep and carry things that we think are important to us.
What makes them important?
A matter of opinion.