It's Tuesday--Illustration Day. Molly Bang has thought a lot about pictures. She's written and illustrated many books, including three Caldecott Honor winners. A short bio is here. Her website is here. She says she spent years trying to understand pictures and how they can convey emotional content, culminating in her book, Picture This: How Pictures Work. See about it here and perhaps order a copy. Watch, below, a couple of appreciations of one of her best known books.