In 1962, Clive Hart wrote the first major book-length study of the work since Campbell's "Skeleton Key", "Structure and Motif in "Finnegans Wake"" which approached the work from the increasingly influential field of structuralism. However through the 1960s it was to be French post-structuralist theory that was to exert the most influence over readings of "Finnegans Wake", refocussing critical attention back to the work's radical linguistic experiments and their philosophical consequences. Jacques Derrida developed his ideas of literary "deconstruction" largely inspired by "Finnegans Wake" (as detailed in the essay "Two Words for Joyce"), and as a result literary theory—in particular post-structuralism—has embraced Joyce's innovation and ambition in "Finnegans Wake". Derrida tells an anecdote about the two books' importance for his own thought; in a bookstore in Tokyo,an American tourist of the most typical variety leaned over my shoulder and sighed: "So many books! What is the definitive one? Is there any?" It was an extremely small book shop, a news agency. I almost replied, "Yes, there are two of them, "Ulysses" and "Finnegans Wake".