Mythology and nature explore the concept of threshold spaces

Literary and geographical explorations highlight the enduring human fascination with liminal spaces, such as mythical islands and subterranean caves. In epic literature, the Odyssey features the island of Ogigia, where the nymph Calypso provides a lush, divine refuge for Odysseus. This mirrors elements in the Epic of Gilgamesh, where the hero encounters the divine tavern keeper Siduri after traversing Mount Mashu, a landscape connecting the earthly and the divine.

Beyond mythology, caves serve as physical transitions between realities. Literary references range from the Cyclops' cave in the Odyssey to Mark Twain’s McDougal Cave. In the natural world, the Gola della Rossa e di Frasassi Natural Park in Italy contains an extensive karst complex discovered in 1971 by a group of young speleologists, illustrating the geological power of water and limestone in creating mysterious, sacred, or protective environments.