Cave (element)

Cave, also known as Anti-Earth (scientific notation: ǝ⊥), is an important element in the Recycloverse. It allows for certain parts of the universe to not be filled with earth, thereby preventing the universe from being a static plenum. Some scientist argue that the absence of Earth cannot be an element, based on Bönkoqvist's Sieve for Dumb Ideas, but the scientific community as a whole remains divided on the issue.