The axis mundi (also cosmic axis, world axis, world pillar, columna cerului, center of the world) is a ubiquitous symbol that crosses human cultures. The image expresses a point of connection between sky and earth where the four compass directions meet. At this point travel and correspondence is made between higher and lower realms. Communication from lower realms may ascend to higher ones and blessings from higher realms may descend to lower ones and be disseminated to all. The spot functions as the omphalos (navel), the world's point of beginning. The axis mundi image appears in every region of the world and takes many forms. The image is both feminine (an umbilical providing nourishment) and masculine (a phallus providing insemination into a uterus). It may have the form of a natural object (a mountain, a tree, a vine, a stalk, a column of smoke or fire) or a product of human manufacture (a staff, a tower, a ladder, a staircase, a maypole, a cross, a steeple, a rope, a totem pole, a pillar, a spire). Its proximity to heaven may carry implications that are chiefly religious (pagoda, temple mount, church) or secular (obelisk, minaret, lighthouse, rocket, skyscraper).