And that's when I got the idea, which was, "" Well, what would happen if we kind of looked at us from this point of view of these other species who are working on us? "" And agriculture suddenly appeared to me not as an invention, not as a human technology, but as a co-evolutionary development in which a group of very clever species, mostly edible grasses, had exploited us, figured out how to get us to basically deforest the world.