In mythological stories, boundaries between realms frequently shift, allowing gods, spirits, and heroes to traverse different dimensions of existence. This fluidity can illustrate the interconnectedness of worlds, such as the mortal, divine, and underworld. Many myths use portals, transformations, or quests to highlight these transitions. For example, in Greek myths, heroes often journey to the Underworld and return, symbolizing the cycle of life and death. This shifting of boundaries emphasizes the dynamic nature of reality as understood by various cultures, conveying a rich understanding of life’s complexities.