Bob Kane his first adventure strip, "Rusty and his Pals". In early 1939, DC's success with the seminal superhero Superman in "Action Comics" prompted editors to scramble for more such heroes. In response, Bob Kane conceived "the Bat-Man." Kane said his influences for the character included actor Douglas Fairbanks' film portrayal of the swashbuckler Zorro; Leonardo da Vinci's diagram of the ornithopter, a flying machine with huge bat-like wings; and the 1930 film "The Bat Whispers", based on Mary Rinehart's mystery novel "The Circular Staircase" (1908). Bill Finger joined Bob Kane's nascent studio in 1938. An aspiring writer and part-time shoe salesperson,
Comic book pseudonymous writer "Drake Waller" (Arnold Drake and Leslie Waller), penciler Matt Baker and inker Ray Osrin, touted as "an original full-length novel" on its cover. In 1971, writer-artist Gil Kane and collaborators devised the paperback "comics novel" "Blackmark". Will Eisner popularized the term "graphic novel" when he used it on the cover of the paperback edition of his work "A Contract with God, and Other Tenement Stories" in 1978. In 2017, the comic book market size for North America was just over $1 billion with digital sales being flat, book stores having a 1 percent decline, and comic book stores