Emmaline found this site and turned me onto it. With registration at AllLookSame being as simple as a username and some demographics (no name, address or such), you can take a number of multiple-choice tests. Food, architecture, art and faces, you choose whether the picture is Japanese, Chinese or Korean. It is not easy. Far from it, proving that we can never assume that we know the nationality of any person we see in our world and the influence of culture upon culture is a beautiful thing.