This behavior might seem confusing if you’re wrongly thinking of variables as buckets that contain data. But if you’re correctly thinking of variables as pointers to objects, then this behavior makes sense.

By decomposing the problem into pieces like this, we make it easy to build our project. Instead of one messy script that does everything, we define the data that will pass between the scripts, and make them completely separate from each other. When you’re working on larger projects, it’s a good idea to do this, because it makes it much easier to change individual pieces without having unexpected consequences on unrelated pieces of the project.