The puzzle-piece representation of structure is neat, but at a 2-minute glance it seems not to scale to real complexity. One of the big ideas in programming is

The puzzle-piece representation of structure is neat, but at a 2-minute glance it seems not to scale to real complexity. One of the big ideas in programming is abstraction/modularity/reuse, and I don't see how that fits in here. (I found the "procedure" block, but I don't see anything that fits inside it other than "break out of loop", which doesn't make any sense. And I don't see how to call the procedure.) So I find myself looking at the samples everyone's demonstrating here and finding they're harder to read than real well-organized code.