[wildranter]

Those little boxes are all boxes there are (except for prolog).

BTW, downvotes are as meaningless as i--.

[icebraining]

Those little boxes are all boxes there are (except for prolog).

No, they aren't, and a simple web search would've revealed others, such as Dataflow[1].

[1]: https://en.wikipedia.org/wiki/Dataflow_programming