I don’t know. Everyone can understand a change of metric. If you decide that what used to be 1cm is now 2cm, everyone will understand that everything is now tw

I don’t know. Everyone can understand a change of metric. If you decide that what used to be 1cm is now 2cm, everyone will understand that everything is now twice as far. Now, imagine that instead of suddenly going from 1cm to 2cm, you do it gradually during say, 1 minute. Well, congratulations, that’s expansion right there. I never understood the balloon analogy. It’s just a bad one.