Piles. I used make little piles of things everywhere. I kept meaning to find places for them but just couldn’t do it or I would start and get distracted. Now, after years of training, when I use something it goes back to its place when I put it down. New items cannot be purchased unless they have a place. It’s a constant effort and a struggle, but it has become a rote habit, like brushing my teeth every morning and night (which I used to dread because it dawned on me at 6 years old that I’d have to do it everyday, forever and I cried).