Yes, I am one of those people who feels that most of my work is adaptation of one sort or another. For me, it's a way to jump-start the engine. For example, some people use the technique of basing a character on a friend. They start writing with his or her voice, then at a certain point, the character takes off on his or her own. It probably no longer resembles the model, but it helped the author to get going. I find that's true of form, too. For every play I've written, I know what play I was trying to imitate. That helps me get going.