Back in the Middle Ages, a dancing egg was often placed in the fountain of Barcelona Cathedral. For that purpose the egg should be emptied and then the hole is filled with wax. Fountains with dancing eggs are still common during some religious holidays. They are also decorated with flowers and seasonal fruits. You can find a dancing egg in few locations in the Gothic Quarter during Corpus Christi: Barcelona Cathedral the Casa de l'Ardiaca, in addition to the courtyards of the Ateneu Barcelonès, the Archives of the Crown of Aragon (at the Lloctinent Palace), the Royal Academy of Arts of Barcelona, Frederic Marès Museum, the cloister of the Monastery of Jonqueres (adjacent to the Puríssima Concepció basilica), Centelles Palace, and the History Museum of Barcelona.