Science fiction engages its audience's imagination to envision speculative futures that can range from the apocalyptic to the optimistic. It is the latter that is explored in The Weight of Light, an anthology of science fiction stories, essays, and art published in February 2019 by Arizona State University's Center for Science and the Imagination (CSI). This free ebook was "inspired by a simple question: what would a world powered entirely by solar energy look like?" To answer it, CSI hosted a narrative hackathon in 2018 where authors, artists, and experts interacted to "create technically grounded, inspiring visions of a future shaped by a transition to clean, plentiful solar energy." The resulting twelve pieces can be found at the link above. Each of the four categories (Big Urban, Small Urban, Big Rural, and Small Rural) features a science fiction story and an illustration, along with at least one essay commenting on various aspects of the world depicted in the story. Visitors can read the anthology online in HTML format or download it as an ePub, iBook, or Mobi file. The Weight of Light was edited by Joey Eschrich and Clark A. Miller.