The world of photography is very self-aware. Everybody is always looking around. So it's quite difficult to stand up with a megaphone and declare, "This is what I think." As a reasonably shy person, I found it difficult to do that.

Reading is always a way of forming a bond with other people. I'm not very good at socializing - I quite like spending time alone - so reading is a way of engaging quite deeply with the way other people think. Quite often when you meet other people socially you don't get to have a conversation of any depth. You end up talking about how well or how badly someone is doing at school or something of that sort. Questions like, "What we are," "Who we are," "Where are we going," you get those from literature and from people that spend some time thinking.

There is a danger in our modern practice of using embedded journalism. As there is less and less money available for journalism to uphold its independence, there is a temptation for people to take short cuts. If this army or that army or this corporation is willing to pay for your flight or your accommodation, then it's much more difficult to tell what the real story might be. I do have a concern about that.

Good photographs aren't just complex. They are enigmatic. Images are beguiling. And the way they play into our psychology, into our visual cortex, is something we still don't understand.

There was a time, right up until the end of the Second World War and beyond, when white people in Europe thought that they basically owned the world and that everybody else was a sort of servant, or a curiosity, or whatever. And that informed 99 percent of the photographic practice that was done. Without being able to address that, I felt I would have failed in my attempt to explain what the urge to document is.

In the documentary impulse, two species of 'fact' exist side by side: one is coolly objective and the other is fraught, diverse and emotive; one figurative, the other abstract; one prosaic, the other poetic; one factual, the other romantic.

Newspaper photographs nowadays are highly tautologous. You'll have an article about, say, stopping the war. And the photograph that will be used is literally a poster that reads "Stop The War." Or you'll have a story about a cash crisis in Barcelona, and the only picture you'll see is an ATM in Barcelona. The problem is actually systemic. On the one hand, you'll have a picture of a soda can to "illustrate" an article about the dangers of sugary drinks. On the other hand, anything that's reasonable in documentary photography is snapped up by the art world and we never see it.