their rightful share of profits from Powers. In 1930, Disney tried to trim costs from the process by urging Iwerks to abandon the practice of animating every separate cel in favor of the more efficient technique of drawing key poses and letting lower-paid assistants sketch the poses. Disney asked Powers for an increase in payments for the cartoons. Powers refused and signed Iwerks to work for him; Stalling resigned shortly afterwards, thinking that without Iwerks, the Disney Studio would close. Disney had a nervous breakdown in October 1931which he blamed on the machinations of Powers and his own overworkso he and Lillian took an extended holiday to Cuba and a cruise to Panama to recover. With the loss of Powers as distributor, Disney studios signed a contract with Columbia Pictures to distribute the Mickey Mouse cartoons, which became increasingly popular, including internationally. Disney and his crew would also introduce new cartoon stars like Pluto in 1930, Goofy in 1932 and Donald Duck in 1934. Always keen to embrace new technology and encouraged by his new contract with United Artists, Disney filmed Flowers and Trees (1932) in full-color three-strip Technicolor; he was also able to negotiate a deal giving him the sole right to use the three-strip process until August 31, 1935. All subsequent Silly Symphony cartoons were in color. Flowers and Trees was popular with audiences and won the inaugural Academy Award for best Short Subject (Cartoon) at the 1932 ceremony. Disney had been nominated for another film in that category, Mickey's Orphans, and received an Honorary Award "for the creation of Mickey Mouse". In 1933, Disney produced The Three Little Pigs, a film described by the media historian Adrian Danks as "the most successful short animation of all time". The film won Disney another Academy Award in the Short Subject (Cartoon) category. The film's success led to a further increase in the studio's staff, which numbered nearly 200 by the end of the year. Disney realized the importance of telling emotionally gripping stories that would interest the audience, and he invested in a "story department" separate from the animators, with storyboard artists who would detail the plots of Disney's films. Golden age of animation: 1934–1941 By 1934, Disney had become dissatisfied with producing formulaic cartoon shorts, and believed a feature-length cartoon would be more profitable. The studio began the four-year production of Snow White and the Seven Dwarfs, based