ELI5: Explain Like I'm 5

Human scale

Human scale is a way to measure how big things are compared to how big people are. People are normally around one to two meters tall. So, if something is one meter tall then it is about the same size as a person. If something is two meters tall then it is two times taller or two times the size of a person. Human scale helps us compare how big things are to things we already know - like people. We can use human scale to make sure that things are the right size for us to use.