I don't have an idea for a play until after I've finished...

I don't have an idea for a play until after I've finished writing it. I write first, and come up with what it's about later. My technique could be compared to having a large canvas and coming in every day and putting a dot on it somewhere, and after several years - literally - I begin to say, That reminds me of an elephant, so I think I'll make it one.