It is believed that the Anasazi just upped and left, leaving almost all of their belongings, which suggests that they probably had a long journey ahead of them. By 1300 the complex and highly developed culture of the Anasazi had disappeared from the area. Fortunately, they left behind artifacts and evidence of their hard work for archaeologists to study. The Anasazi religion was based on maintaining harmony with the natural world, which was key to the survival of the ancients. Observing the sun, moon, and stars was essential for planning activities such as planting and harvesting. The rituals were annual events such as the winter solstice or the beginning of the harvest season. Pecked animal figures or images painted on rock faces may have been linked to prayers or magical rituals for successful cultivation and hunting. There is evidence that ancestral Pueblos occasionally sought visions using seeds of the hallucinogenic plant Datura. Seeds have been found at Mesa Verde, and some ceramic pots are decorated with Datura seed pods. Pueblo priests helped bring rain through ceremonies and prayers. Like shamans, they are thought to have a special level of communication with gods