I produced this as an illustration of one of the datasets we're using on our new project, GRIT. Controls explained on the right, but the main thing: clicking on sectors will remove all but the largest 5% of in-flow and out-flow trade connections, making it easier to follow the flows. (And toggling physics off will help with that too, probably...)

I'll be working on more/better ways to 'see' spatial economics as the project goes along and we get into the geography further.