A collection of written works that primarily revolves around imaginative and futuristic concepts such as advanced science and technology, space exploration, time travel, parallel universes, and extraterrestrial life. This category also extends to books discussing the fundamental principles and established precedents according to which a state or other organization is acknowledged to be governed, alongside literature that provides a knowledge and appreciation of visual arts. It also encompasses literature based on facts and reality, including biography, history, and works on self-help and personal development.