Today is the Feast of Corpus Christi, a Western Catholic tradition. Catholics (and a few other religions) celebrate this day with processions through the streets of towns and cities around the world.
But something that seems to be unique to Barcelona (or certainly Catalonia) is the tradition of L’Ou com Balla (the Dancing Egg).
There are many stories as to its origins. Some say it’s a metaphor for the cycle of life or simply that it was an amusement for the nobles as the processions went by (which I much prefer). But it does seem to have been going on for a rather long time. Since the sixteenth century! That’s quite a few eggs!