If this is a teach all the kids programming, I would go with bottom left, or center as origin. No need to complicate it for people who will never use it again.

If this is a teach all the kids programming, I would go with bottom left, or center as origin. No need to complicate it for people who will never use it again. If this is intro to coding 1 of N. Then go top left. They will have to learn the map is not the territory at some point why not with this easy example. It will also help when they try to take what they learned beyond the course.