Typewriter the first major typewriter with these features. However, older "nonvisible" models continued in production to as late as 1915. A significant innovation was the shift key, introduced with the Remington No. 2 in 1878. This key physically "shifted" either the basket of typebars, in which case the typewriter is described as "basket shift", or the paper-holding carriage, in which case the typewriter is described as "carriage shift". Either mechanism caused a different portion of the typebar to come in contact with the ribbon/platen. The result is that each typebar could type two different characters, cutting the number of keys and
Typewriter in the Sky and Fantasy: Themes, Works, and Wonders" (2005), Gary Westfahl commented, "Recursive fantasy fiction – that is, a fantasy about writing fantasy – is scarce. Luigi Pirandello's play "Six Characters in Search of an Author" (1921) offered a non-genre model." Westfahl noted that Hubbard's book was "an early genre example, perhaps inspired by Pirandello". Umberto Rossi wrote in "The Twisted Worlds of Philip K. Dick" (2011) that "Typewriter in the Sky" included a game in the form of metafiction within its plot development. "Typewriter in the Sky" is well regarded within the genre of fantasy; author David Wingrove noted in "The