I think visual programming would match some problem domains very well, such as games (Unreal Blueprints), music (Reason, Max, PD), Neural Nets (???), UI (Quartz

I think visual programming would match some problem domains very well, such as games (Unreal Blueprints), music (Reason, Max, PD), Neural Nets (???), UI (Quartz Composer), robotics (???), as well as the already mentioned spreadsheets. Most of these domains focus on flow and transition of scalars. The problem that I've had in the past with PD and MAX is in coordinating of multiple inputs that flow into a node. Sometimes I'd have to create a special node to properly sequence inputs. But, that is a limitation of the tool, not the idiom. Another problem is how to explore and manipulate a flow graph? I like the idea of using a force directed graph. Here is one, where I mapped a visual music synthesizer to Jeffry Heer's Prefuse toolkit: https://www.youtube.com/watch?v=a703TTbxghc https://www.youtube.com/watch?v=a703TTbxghc Would love to explore authoring flow, using force directed graphs on an iPad pro + pencil (and its ilk), where one could not only draw arc between nodes, but also between convex hulls of a collection of nodes.