For children
It can be tricky when you are just a little kid and you need to use a public bathroom. Your parents usually accompany you inside as you try to use toilets that were made for adults. But the Japanese have smaller options for all the kids out there that just need to relieve themselves as well.
If this list has taught us anything it is that the Japanese are just very considerate people. They think about everyone and how they can make their lives feel a little easier. Who else would even think about kids and how they use the bathroom in public places? This is a first for us.