A number of cyberpunk derivatives have become recognized as distinct subgenres in speculative fiction. These derivatives, though they do not share cyberpunk's computers-focused setting, may display other qualities drawn from or analogous to cyberpunk: a world built on one particular technology that is extrapolated to a highly sophisticated level (this may even be a fantastical or anachronistic technology, akin to retro-futurism), a gritty transreal urban style, or a particular approach to social themes.