April 23th is St. George Day. It is a very special occasion in Catalonia and specially in Barcelona, the whole city is plenty with Catalonian flags. It is a custom to give a rose as a gift in this day; some of the buildings show some roses decoration as it is in the case of this photo. It corresponds to the iconic Casa Batlló built by Gaudí. The giant roses in the façade of the building are artificial.