Books. I have over 5000. No, I didn't add an extra zero by mistake....
I had a thing about cassette tapes back in the day, and then CDs, and DVDs. I also did the crystal thing. And have more shoes than I need. And do the same thing with my clothes and closet except I add another category for short or long sleeve.....
Also a neat freak in my office, the kitchen, my garage. Everywhere really. I'm a nightmare to live with, which is why I am where I am. Even contemplating tidying my garden now and it's dark.......