David Macaulay — American Artist born on December 02, 1946,

David Macaulay is a British-born American illustrator and writer. His most famous works include Cathedral, The Way Things Work and The New Way Things Work. His illustrations have been featured in popular, nonfiction books combining text and illustrations explaining architecture, design and engineering. He was a 2006 recipient of a MacArthur Fellows Program award and also a recipient of the Caldecott Medal in 1991 for Black and White... (wikipedia)

I'm a big fan of the digestive system.
I've never thought about the ages of my readers.
If you are lucky enough to be successful, you get drawn further in and you stop paying attention to the stuff that matters.
Making books is hard work. Some books are, of course, more demanding than others.
Occasionally, I just need to escape from my work or be reminded of the comparative bliss of my own life, so I pick up a novel.