India, Aug. 16 -- "There are parts of our food system that some people don't want us to see." You say that in your author note. What was the most invisibilised part of the food chain that you photographed?

Animal operations are quite sensitive to get access to. People get really touchy because there's been -- especially in the industrialized world -- a lot more concern about animal rights and farmers get criticized a lot for it. Then, there's large scale agriculture. People in the corporate world are very cautious. When you go to a private farmer who has five acres of land and you want to photograph them harvesting their stuff, there's no issue. But when you get into corporations, they get nervous and the lawyers get involved and it gets...