The problem is when you get forced to use ideas that aren't good. When I can filter the ideas and use the best of them, I am happy to collaborate.

I've always loved 3D. In fact, as a kid, I was exposed to 3D at an early age because my grandfather was a specialist of 3D in cinematheques. And then my cousin put it in 'Science of Sleep' with toilet paper tube cities. But he was a specialist and I always wanted to do something in 3D.

I've always liked the idea of inventing stuff. My father told me, because I was naïve, I would think things could work and therefore do them, because I would have no doubt even though there was no solid foundation for this confidence. I don't think I would be a real inventor. But when I set out to do animation, which was my first step into film-making, I realised I could achieve this idea. I could take some elements, create a sort of clumsy invention, and make them work for the camera.

I'm always excited to work with actors.

I think the purpose of test screenings is different for the studio and for the filmmaker. For the studio, I think they want to know whether the film works or not.

If I have a good dream and I wake up happy. When I have an idea, I feel happy. Sometimes achievement and relationships can make me happy. I have a son and to see him grow - he's 22 now - that makes me happy.

I don't mock things, which makes me more vulnerable to mockery myself. If you're cynical, you're protected from mockery. But I have to be nice. I don't think I have irony. A sense of humour, yes, but not irony.