Deities in ancient Mesopotamia were almost exclusively anthropomorphic. They were thought to possess extraordinary powers and were often envisioned as being of tremendous physical size. The deities typically wore melam, an ambiguous substance which "covered them in terrifying splendor" and which could also be worn by heroes, kings, giants, and even demons. The effect that seeing a deity's melam has on a human is described as ni, a word for the "physical creeping of the flesh". Both the Sumerian and Akkadian languages contain many words to express the sensation of ni, including the word puluhtu, meaning "fear". Deities were almost always depicted wearing horned caps, consisting of up to seven superimposed pairs of ox-horns. They were also sometimes depicted wearing clothes with elaborate decorative gold and silver ornaments sewninto them.
The ancient Mesopotamians believed that their deities lived in Heaven, but that a god's statue was a physical embodiment of the god himself. As such, cult statues were given constant care and attention and a set of priests were assigned to tend to them. These priests would clothe the statues and place feasts before them so they could "eat". A deity's temple was believed to be that deity's literal place of residence. The gods had boats, full-sized barges which were normally stored inside their temples and were used to transport their cult statues along waterways during various religious festivals. The gods also had chariots, which were used for transporting their cult statues by land. Sometimes a deity's cult statue would be transported to the location of a battle so that the deity could watch the battle unfold. The major deities of the Mesopotamian pantheon were believed to participate in the "assembly of the gods", through which the gods made all of their decisions. This assembly was seen as a divine counterpart to the semi-democratic legislative system that existed during the Third Dynasty of Ur (c. 2112 BC – c. 2004 BC).