All these books are recommended for ages 3 or 4 up. First a fine artist, then a children's book illustrator, he started writing more of his own stories, often with children learning strange and interesting lessons about their roots. His newest is about a little girl named Madlenka who lives in New York City. Her block is her world, literally and figuratively. Neighbors are Italian, German, Asian.
Neighbors represent lands around Earth.
So when Madlenka discovers a loose tooth, she tells the world. His art, as in all his books, is enchanting. M.C. Escher-like on one page. Gameboard-like on another. Originals probably go for big bucks in galleries.