Literary examples include Edgar Rice Burroughs' Back to the Stone Age and The Land that Time Forgot, and Jean M. Auel's "Earth's Children" series, beginning with The Clan of the Cave Bear. Riichiro Inagaki's manga series Dr. Stone can also be considered stonepunk. Other proposed science fiction derivatives There have been a handful of divergent terms based on the general concepts of steampunk. These are typically considered unofficial and are often invented by readers, or by authors referring to their own works, often humorously. A large number of terms have been used by the GURPS roleplaying game Steampunk to describe anachronistic technologies and settings, including stonepunk (Stone-Age tech), bronzepunk (Bronze-Age tech), sandalpunk/ironpunk (Iron-Age tech), candlepunk (Medieval tech), clockpunk (Renaissance tech), and atompunk/transistorpunk (Atomic-Age tech). These terms have seen very little use outside GURPS. Raypunk Raypunk (or more commonly "Raygun gothic") is a distinctive (sub)genre that deals with scenarios, technologies, beings or environments, very different from everything that is known or what is possible here on Earth or by science. It covers space surrealism, parallel worlds, alien art, technological psychedelia, non-standard 'science', alternative or distorted/twisted reality, and so on. It is a predecessor to atompunk with similar "cosmic" themes, but mostly without explicit nuclear power or definitive technology. It is also distinct in that it has more archaic/schematic/artistic style; and its atmosphere is a more dark, obscure, cheesy, weird, mysterious, dreamy, hazy, or etheric (origins before 1880–1950), parallel to steampunk, dieselpunk, and teslapunk. While not originally designed as such, the original Star Trek series has an aesthetic very reminiscent of raypunk. The comic book series The Manhattan Projects, the animated film Fantastic Planet (La Planète Sauvage) and the pre-WWII Buck Rogers and Flash Gordon comics and serials would be examples of raypunk. Nowpunk Nowpunk is a term invented by Bruce Sterling, which he applied to contemporary fiction that is set in the time period (particularly in the post-Cold War 1990s to the present, or a future where that particular time period is influential) in which the fiction is being published, i.e. all contemporary fiction. Sterling used the term to describe his book The Zenith Angle, which follows the story of a hacker whose life is changed by the September 11 attacks in 2001, This genre can often be identified for its strong use of '80s and '90s fashion and music, Gen-X and Millennial pop culture references, video games, early MTV, Japanese