They are little tiny 6" tall walls that you can step over. Like micro-walls. Except for the bits where you have no walls at all. Like if you install literally a

They are little tiny 6" tall walls that you can step over. Like micro-walls. Except for the bits where you have no walls at all. Like if you install literally any programming language, HomeBrew, or MacPorts. The walls in the walled garden only exist in the heads of people who never use a Mac.