I had a physics text book, and had spilled coffee which splattered covering the inside cover a the edges of the pages in a marbleized looking leopard pattern.
A class mate asked where I got the book, and I said the book store. He insisted on trading books and offer 10 $ to exchange. I told that our books were the same, but he insisted.
A few days later he wanted to trade the book back once he realized that the book was only coffee stained, but I kept the 10$.
It got a few beer stains on it over time, and the general patina was nice.
I look at the Bosch rail with the cut on it and fondly remember that day that I was building a wall for the Mrs.
It is similar to my wife's chin scar from being ejected off a horse, and my daughter's similar scar from disembarking off a bicycle.
While they are hard to notice, those patinas mark themselves in time and place and add character.
But they are usually only appreciated by the those involved with the time and place of the events.