The beautiful article linked below is from the Guardian and regards how politeness pervades Japanese society, written from an Australian perspective. The article ends: “Does Australia have anything that Japan doesn’t? Yes! The new $5 note, designed with a raised bump so blind people can identify it.”
Actually, all Japanese currency is designed so that sightless can identify it by touch. Look at the bottom corners of any of your bills and you’ll see raised print areas of different shapes for each denomination. Those with sight may not notice them, but those without tend to become very sensitive to touch - and they can. The image below is of the raised print signatures on each bill. - William