Creation myths take place in some early primordial age when the world had not reached its present form. Other myths explain how the society's customs, institutions and taboos were established and sanctified. A separate space is created for folktales, which are not considered true by the people who tell them. As stories spread to other cultures or as faiths change, however, myths can come to be considered folktales. Sometimes myths and legends get merged. Their divine characters get recast as humans or as demihumans (such as giants, elves, and faeries).