Great A'Tuin is a giant cosmic turtle that carries the four elephants, Berilia, Great T'Phon, A'Tuin, and Great A'Tuin, on its back. These elephants, in turn, support the Discworld, a flat planet that is home to various species and cultures. The concept of Great A'Tuin originates from Terry Pratchett's Discworld series, where it symbolizes the vastness and mystery of the universe. The turtle swims through space, representing the idea that life exists on a grand scale, with interconnectedness between all beings and their environments.