For the first time the MNAz presents an exhibition of arqueological contents. These materials were collected from four hovens that once belonged to ceramic production in Lisbon, from around the end of the XVI century and beginning of  the XVII century. These hovens suffered an accident and the materials we now show are very important for the comprehension of the procedures associated to the manufacture of clay and  faience pieces of this period. Beyond the historic information we are facing objects that were destroyed, but even so they captivate us with their beauty, that can only be found in imperfection.