Mesopotamian ARCHITECTURE is characterised by the use of: Bricks: pieces of clay baked in an oven. Glazed ceramics or tiles were used to decorate the brick walls. Semicircular arches: a semicircular structure with a supporting point at each end. Vaults: roofs in the form of an arch (formed by several arches). The ZIGGURAT was the main sacred building. These buildings were composed of several levels of brick terraces in the form of a step pyramid. The sanctuary was situated in the highest terrace and contained the statue of a god or goddess. The most important civil building (non-religious) was the palace, the residence of the kings and their attendantsESOPOTAMIAN SCULPTURE. Types: 1. Reliefs: sculptures which protrude from a surface (walls, doors). 2. Steles: commemorative reliefs on vertical stone. 3. Freestanding sculptures: not part of another surface. These usually represented gods or governors in prayer or contemplation.