I visited the UK recently, and I was quite impressed by the accessibility of their banknotes compared to the US ones: * braille on the notes * different color

I visited the UK recently, and I was quite impressed by the accessibility of their banknotes compared to the US ones: * braille on the notes * different colors for different denominations * different sizing for different denominations The UK notes are far more accessible to the blind and the illiterate, and it becomes basically impossible to accidentally include a £100 note in a stack of £5s. They also have holographic printing like the US notes, but theirs are full images embedded in transparent windows. I know that it would be basically impossible for us to do likewise (our currency is designed to be backwards compatible, and the vending industry would probably throw a fit if you changed the size of the bill on them), but one can wish.