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This is great. Has this approach to visualizing loops and structures been tried with general programs? Indentation and color coding seems to be the limit to the visual expressiveness in most IDEs because they tend to stay withing the format of plain text files.

I'd really like to see some more creative visuals like this for making program structure visible.

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I don't know if there's a name for this style of display, but it's the same as the way JSON is depicted on its official site. http://www.json.org

Edit: It's called a Railroad Diagram.

No, it's called a finite state machine ;)

The FSM is the model, the Railroad Diagram is the view, to borrow terms.

Well, as long as we're picking nits, an FSM accepts only regular languages, while a rail road diagram accepts context-free languages[1]. So a railroad diagram isn't really the "view" for an FSM. A state-diagram or state-transition table is (although the whole MVC analogy is itself kind of weird. Where's the controller?).

[1] http://en.wikipedia.org/wiki/Syntax_diagram

>Where's the controller?

The MV* family of patterns seems to be okay without the notion of a controller.

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