He is reading the American Heritage Dictionary. Why? He's trying to figure out how long it takes for chicken eggs to hatch. Also, showing me another page with a diagram of a rose, he said he wants to know how long it takes for a flower to bloom. He estimates 1 - 2 months for a flower and 2 weeks for chicken eggs.
I asked him if he has a favorite book or author and he said no, that he just likes to read the dictionary. (He had two more dictionaries at his feet.) It seemed that he was doing more than reading, though, that he was using the dictionary as a jumping off point for inspiration. Like any book, a dictionary can be a conversation between the author and the reader, if you're creative.