I have distinct childhood memories of my mother’s wallet. She always has—and always will—sorted her cash by denomination. Fives, then tens, then twenties. Always grouped in the proper order and neatly stacked together. With the fronts facing out and all of the heads on the bills aligned. As a kid, I remember waiting patiently for her as she carefully put her change away after paying for our groceries. It was all in place before she set foot outside the store.