The Black Magician Trilogy' was about a conflict between countries and was very limited and almost claustrophobic in its range of settings, while 'The Age of the Five' was about a conflict between continents.

The first rule of world-building is available physics, which basically means that if you want it to feel real, it has to follow the same rules as this world, from gravity to how human behaviour works. If you have a fantasy element that doesn't obey the laws of physics, make sure that it has a fantasy explanation.

I wound up studying art and design, got a job at Lonely Planet Publications as a designer, cartographer and illustrator.

I always love writing the third book in a series because you get to tie up all the threads that you put out in the first two books. You finally let people know what really happens and reveal all the secrets and bring certain characters together.

Space doesn't offer an escape from Earth's problems. And even with nuclear fuel, the transit time to nearby stars exceeds a human lifetime. Interstellar travel is therefore, in my view, an enterprise for post-humans, evolved from our species not via natural selection, but by design.

As animation directors, you're the first one on the film; you're the last one off, and you get to learn from and touch every department throughout the whole journey. I don't know any other job in the world that's like that. I don't think live-action is like that. It's a very different sort of experience.

Everyone is an entrepreneur. The only skills you need to be an entrepreneur: an ability to fail, an ability to have ideas, to sell those ideas, to execute on those ideas, and to be persistent so even as you fail you learn and move onto the next adventure.

I'm not talking about what you hear from 5 per cent of the population on the radio, in the papers. I don't pay attention to it. I travel around the country. I'm happy I have a good relationship with the people.