In my pocket there is lint. There is lint because of what I put inside my pockets, and because of how frequently I do so. For example, I put my wallet in my left pocket. It is made of leather, and with time, the articles within my leather wallet stretch, harden and reshape it. During this, no doubt, particles of leather drop as dust into the crevices of my pockets.
In my pocket and also making lint are my keys. I use my keys to unlock many things. Front doors, car doors, bike locks, pad locks. My keys take my lint and (no doubt) leave it inside whatever it is I must unlock that day. in exchange, they remove other particles, germs or dust with their rigid angles and find their way back into my pocket. I realize now that my lint is not just mine, but possibly many other people’s as well.