Urizen's daughters started as the children of light and are possible images of either the planets or of the stars. After his fall, they gain human form. Three of his daughters are Eleth, Uveth and Ona, which represent the three parts of the human body. Together, they also organize the waters of Generation, they are the creators of the Bread of Sorrow, and read from the Book of Iron. At the Last Judgment, they watch over Ahania. His sons are differently organised, in different poems: as Thiriel, Utha, Grodna, Fuzon, aligned with the four classical elements; or as twelve, aligned with the signs of the Zodiac, and builders of the Mundane Shell and seek to keep mankind from falling. In Blake's early myths, they dwell in various cities and do not abide by Urizen's laws; Fuzon directly rebels against Urizen, is able to cut Urizen's loins, and is crucified for his actions. In later versions of the children, they are wise and dwell with Urizen. They, with Urizen, fall after Luvah takes over Urizen's realm. After their fall, they are tortured in hell, and Urizen's creation of science is seen as his domination over them. However, the four sons are placed in charge of Urthona's armies and rebel against Urizen's rule. During the Last Judgment, the sons get rid of their weapons and celebrate Urizen's return to the plow, and they join together for the harvest.