In mythology, portals and entrances symbolize transitions between worlds—often reflecting the duality of reality and the unknown. These thresholds can signify crucial changes, such as life and death, or the journey from the mundane to the divine. They illustrate the idea that transformations and new experiences lie just beyond the familiar, urging individuals to confront their fears and embrace growth. Such symbols are central to many myths, showcasing the human journey through challenges and new beginnings.