A few weeks ago, I accidentally overheard a summer conversation between primary school children from Mallorca, about ten years old. They were talking about the last school year and one of them let slip, with the naturalness with which one says things heard at home, that "the best day of the school year was the day of the Feast of the Sacrifice". The others laughed and agreed. There was no need to explain it: it is a day when most of their Maghrebi classmates do not go to class. These children haven't invented anything. They are reproducing, as children always do, what they have heard adults say. And that is, precisely, what should worry us.