I love the idea, and had no idea this data was available. However, the visualization is close to useless (except it looks good on news sites). I wanted to examine @Theodores comment about Brexit, but I can't even do something as simple as figuring out whether the UK is a net importer from / exporter to Europe (or approximately equal).

It makes me want to play around with the data [1] myself, although getting all the data looks a bit involved. And it's not an easy visualization, either. Not only is there a geometry problem and a dimensional problem, it looks like countries might import from and export to the same country in the same type of good. In 2015 for "26 - Ores, slag, and ash", apparently the UK imported $187m from Canada and exported $155m to Canada. (But maybe the units are $1k, as the UK importing $2+ billion total seems a bit low?) Not only does that seem a little counter-intuitive--what ores is the UK even mining, let alone exporting? Anyway, representing both directions seems challenging.

[1] https://comtrade.un.org/data/