Rituals are basically conventional forms of behaviour – the stuff that fashions and traditions are made of. They’re not just important in our own society—they’re important in every human society, as far as we can tell, going back into deep history and prehistory. And so they are part of our collective inheritance. They vary a lot, but the thing is rituals are universal, and at the same time, they’re the building blocks of cultural diversity, of traditions that make us distinct from one another.