Douglas R. Hofstadter is the author of "Shakespear's Plays Weren't Written by Him, But by Someone Alse of the Same Name" (1982), Metamagikum (1982), Gödel, Escher, Bach : an eternal golden braid ; [a metaphorical fugue on minds and machines in the spirit of Lewis Carroll] (1981), Mathematische Spielereien (1981), To egō tēs noēsēs (1981).