The living creatures, living beings, or hayyot (Hebrew חַיּוֹת ḥayyōṯ) are a class of heavenly beings in Jewish mythology. They are described in the prophet Ezekiel's vision of the heavenly chariot in the first and tenth chapters of the Book of Ezekiel. References to the sacred creatures recur in texts of Second Temple Judaism, in rabbinical merkabah ("chariot") literature, in the Book of Revelation in the New Testament, and in the Zohar. According to Jewish and Christian traditions, there are four living creatures, although their description varies by source. The symbolic depiction of the four living creatures in religious art, especially Christian art, is called a tetramorph. Ezekiel's vision of the four living creatures in Ezekiel 1 are identified as cherubim in Ezekiel 10, who are God's throne bearers. Cherubim as minor guardian deities of temple or palace thresholds are known all over the Ancient East. Each of Ezekiel's cherubim have four faces, that of a man, a lion, an ox, and an eagle. However, the fact that they manifest in human form sets them apart from the griffin-like cherubs and lamassu of Babylonia and Assyria. Concerning their ability to move, Ezekiel's cherubim do not need to turn, since they face all compass points simultaneously. This description of movement differs from that of the seraphim in Isaiah's vision () who have an extra set of wings, giving them the ability to fly. In , four living beings (Greek: ζῷον, zōion) are seen in John's vision. These appear as a lion, an ox, a man, and an eagle, much as in Ezekiel but in a different order. They have six wings, whereas Ezekiel's four living creatures are described as only having four. In verse 6, they are said to have "eyes all over, front and back", suggesting that they are alert and knowledgeable, that nothing escapes their notice. The description parallels the wheels that are beside the living creatures in Ezekiel 1.18; 10.12, which are said to be "full of eyes all around". The Hebrew word for "wheel" (ôpannîm) was also used in later Jewish literature to indicate a member of the angelic orders (1 Enoch 71.