It's Illustration Tuesday. Eric Carle is a children's book creator who brings lots of joy to his books, and they, in turn, give joy to children and grown-ups. He brings joy to the creating of his books because of his playfulness and love of color. To make a good book, it's helpful to be playful and experimental in the process. If you illustrate, enjoy the rainbow of your paints, if you're a writer, in your colorful words. Play is the way!