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It might not be clear, but here's an application to generate cities 'procedurally' using data flow operators

The possibilities of this 'paradigm' are pretty unbouded and not tied to the usual programming data types.

That's not just an application for procedural cities, that's Houdini (http://www.sidefx.com/), a relatively well-known 3D modeling, animation and rendering tool based on the node-based (a.k.a. functional) approach. I investigated them, and while I found the tool itself very powerful, its language is not a proper general-purpose functional language, and I don't think it's turing-complete (if you exclude their integrated Python scripting).

Yeah, I didn't imply it was a tool dedicated to this task, it's just a non-traditional example of dataflow (most of the time I see signal, maybe image composition, very regular data types).

You're right that the node-based part is not a proper GPFP. I just wanted to link a 'complex' application of the visual ~functional (if piping is function composition is correct) kind.

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