The grass, I mean story, I mean play, I mean novel....

Whenever I'm writing a play, I wish I were writing a novel. When I'm working on a novel, I wish I were writing stories. When I'm writing stories, all I can think about is the next play I want to write. And round and round. And the more I yearn after other forms, the more wan and limp my current work seems to me. The words are always greener on the other side of the keyboard. Or something.