A Mental World is any world that exists inside a person's mind (or heart, soul, whatever, but not their physical body). Similar to Dream Land and Cyberspace, a Mental World does not follow the regular laws of physics, and may ignore or respond badly to characters trying to use logic or force. This world is usually entered by some type of telepathy, either magical or technological; if the character whose mind contains the Mental World is sleeping or unconscious their individual dreamworld may be physically attached to a larger Dream Land or collective unconscious, which makes it enterable by other dreaming or meditating people.