In our human endeavors, we use masks for both social and expressive reasons. They are used for funeral or fertility rituals, to mold the behavior of group members through admonition or supplication, and to enhance group ceremonies that impact intra-group relationships or those with the larger world. Historically, masks are used to commune with gods and goddesses, to heal the sick, change the weather, or portray characters in plays or reenactments of mythological events. Today, masks are found at festive occasions such as birthdays and Carnival.