The cash culture in Japan is a good thing in general. Good for privacy and financial inclusion. The bills are different sizes, which is a sensible design choice to help the visually impaired. One yen coins should be eliminated, like US pennies. Inflation has made them useless. When checking out at convenience stores and some other establishments, the cashier doesn't touch your money. Instead you insert cash and coins into a machine. Makes it seem a little weird because in US stores, you just put the money on the counter and the cashier counts it and puts in the till by hand. Japan also has TONS of vending machines. To me it's funny that in Japan you take cash from ATMs and later just put it into other machines, for the most part.