During my stay in Geneva (where almost half of the population are immigrants), I have tried to spy non-white people’s looks and to determine why a person of certain ethnicity looked like a person of certain ethnicity. Partially this was influenced by that I was participating a small forum roleplaying game in which I play a Botswanan girl, and I wanted to get her drawing right.
In other words, I was kinda making mind-games like, “Okay, that dude looks Asian, perhaps Chinese. Okay, why do I think that this dude looks Chinese? Well, firstly, his hair is dark and wispy, and secondly, I don’t see those wrinkles over his eyes. The bridge of his nose is also quite flat. He probably isn’t South Asian, because his skin tone is too fair, and something makes me think he isn’t Japanese, but I can’t quite pinpoint it...” And going into detail with it. Surprisingly entertaining and perhaps educating, too.