Moulds were not only made from the original punch, but also often from tiles themselves. This leads to a natural "shrinkage" of the new tiles' dimensions. Because the moulds were sometimes reused for long periods of time, there are sometimes noticeable changes in the size of the tiles. For the motif depicting the Curetes performing a weapon dance around the baby Zeus, the moulds can be traced over a period of 170 years. In the process, the tiles lost about 40% of their size as a result of the repeated reuse of completed tiles as moulds. Therefore, in tiles which share a motif, the smaller can be identified as the younger. The motif also lost clarity through repeated remoulding. Even when it is known exactly where a relief tile was found, there is no absolute certainty because to this day no tiles have been found in the place of their original use. Scholars largely agree that the tiles served decorative and practical functions, although it is uncertain exactly which part of the building they were placed on. Their origin in Etruscan-Italiote temple architecture is clear and certain, but it can nevertheless be assumed that temples were not the primary usage context at least in the tiles' later phases. On account of their consistently modest scale, the reliefs were more suitable for close viewing, which implies use on smaller buildings. Whereas their Etruscan and Italiote precursors served to cover wooden temple roofs and protect them from weathering, the Campana reliefs seem to have been used far more in secular contexts. There they lost their protective functions and became wall decorations. For a time both forms of use were found side by side on temples, until finally the Campana reliefs lost their older use. On account of their fragility, the bricks must have been replaced often - it is suggested that this would have occurred once every twenty-five years or so. At first they were replaced with copies of the previous decorative tiles, but later newer motifs were substituted also. Increasingly from the first century stone temples replaced earlier buildings in wood, and Campana reliefs were only used in restorations. Campana reliefs can be arranged on five bases: chronology, geography, iconography, shape and use. The most productive system is classification based on the shape of the tile. The categories used are cladding tiles, ridge tiles, sima tiles, crowning tiles and antefixes. These terracotta tiles had parallels in their development with the marble decorative reliefs of the "neo-Attic form" of the Late Republic and Early Empire, though their dissimilar shapes were not necessarily mutually dependent.