Refugees from the violence of wars and the brutality of famished lives have knocked on other people's doors since the beginning of time. For the people behind the doors, these uninvited guests were always strangers, and strangers tend to generate fear and anxiety precisely because they are unknown. Today we find ourselves confronted with an extreme form of this historical dynamic, as our TV screens and newspapers are filled with accounts of a 'migration crisis', ostensibly overwhelming Europe a ...