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Indeed, the map is hard to parse. I think that this presentation gives good advice regarding maps design: https://speakerdeck.com/cherdarchuk/data-looks-better-naked-...

That was my first thought, I'm currently learning one coloured in red, and looked at the map and thought "oh *".

Really interesting to hear the approaches to learning, currently going through Duolingo which is helping with vocab, but don't think it's going to help at all with proper conversation.

The colours are also a poor choice for people who are colourblind.

I made the map and chose it that way just because I associate germanic languages and english with the colour red. I changed it in a later version.

https://imgur.com/gallery/37xlzKE

I think they choose red..violet color spectrum as a base for easy..hard axis. Doesn’t explain light red though. Anyway, it is unusual and very hard to read.