Science fiction may seem resolutely modern, but the genre could actually be considered hundreds of years old. There are the alien green “children of Woolpit”, who appeared in 12th-century Suffolk and were reported to have spoken a language no one could understand. There’s also the story of Eilmer the 11th-century monk, who constructed a pair of wings and flew from the top of Malmesbury Abbey. And there’s the Voynich Manuscript, a 15th-century book written in an unknowable script, full of illustrations of otherworldly plants and surreal landscapes.