Despite all the transformations in the industry, by 1961 the average production cost of an American feature film was still only —after adjusting for inflation, less than 10% more than it had been in 1950. The traditional twin bill of B film preceding and balancing a subsequent-run A film had largely disappeared from American theaters. The AIP-style dual genre package was the new model. In July 1960, the latest Joseph E. Levine sword-and-sandals import, "Hercules Unchained", opened at neighborhood theaters in New York. A suspense film, "Terror Is a Man", ran as a "co-feature" with a now familiar sort of exploitation gimmick: "The dénouement helpfully includes a 'warning bell' so the sensitive can 'close their eyes.'" That year, Roger Corman took AIP down a new road: "When they asked me to make two ten-day black-and-white horror films to play as a double feature, I convinced them instead to finance one horror film in color." The resulting "House of Usher" typifies the continuing ambiguities of B picture classification. It was clearly an A film by the standards of both director and studio, with the longest shooting schedule and biggest budget Corman had ever enjoyed. But it is generally seen as a B movie: the schedule was still a mere fifteen days, the budget just $200,000 (one tenth the industry average), and its 85-minute running time close to an old thumbnail definition of the B: "Any movie that runs less than 80 minutes."