It's common in many Catalan families to take a piece of wood 30 cm long home for holidays. The log called Tio de Nadal is placed in the room and a smiling face is drawn on it. Since the Feast of the Immaculate Conception on December 8 the log is given a little bit of food and covered with a blanket to keep it warm. Children are supposed to take good care of it to get a lot of presents.
On Christmas Eve the Tio is asked to defecate, while children are supposed to leave the room and pray asking Tio to deliver presents. When they come back they find presents under the blanket.