It's all Greek to me

“When an English speaker doesn’t understand a word of what someone says, he or she states that it’s ‘Greek to me’. When a Hebrew speaker encounters this difficulty, it ‘sounds like Chinese’. Which begs the question: “Has there been a study of this phrase phenomenon, relating different languages on some kind of Directed Graph?” Well apparently there has, even if only perfunctorily, and the result is this cartogram - and this report (of kinds).