It's easy to write a short story and frighten people for five pages, but to work at length, when you do it as in 'The Turn Of The Screw' or 'A Christmas Carol,' it's different; you have to build it and build it.

I've never written poetry. I'm not a poet, but I think the nearest you get is either the short story or the novella, in that you can't waste a word. There is no hiding place: everything's got to be seen to relate, and the prose counts.