The Piano Lesson' is very sophisticated, easily the most adult or complex material I've attempted. It's the first film I've written that has a proper story, and it was a big struggle for me to write. It meant I had to admit the power of narrative.

But short films are not inferior, just different. I think the short gives a freedom to film-makers. What's appealing is that you don't have as much responsibility for storytelling and plot. They can be more like a portrait, or a poem.

Between 18 and 26 I acted professionally, on the stage and a little bit on television. Acting is okay, but it's quite pressurized. Then I went to England - I wanted to reinvent myself.

Eight years ago, I was drawn into Keats's world by Andrew Motion's biography. Soon I was reading back and forth between Keats's letters and his poems. The letters were fresh, intimate and irreverent, as though he were present and speaking. The Keats spell went very deep for me.

There are some things that are real, that you can see, that you can observe, like the moon, and grass and things. But for ideas to become real, they have to be played on your senses.

I took four years off after 'In the Cut' because I wanted to see who I'd be without work. I even tried being a hermit in the wilderness in New Zealand. I stayed in a warden's hut two-and-a-half hours off the Routeburn Track through the fjords on the South Island. It was early winter, so there was no electricity or running water.

I think I made good movies.