Lois Ehlert (1934-2021) illustrated numerous inventive, celebrated, and bestselling picture books, including Chicka Chicka Boom Boom, Mice, Ten Little Caterpillars, and her own Holey Moley, The Scraps Book, RRRalph, Lots of Spots, Boo to You!, Leaf Man, Snowballs, Waiting for Wings, Planting a Rainbow, Growing Vegetable Soup, and Color Zoo, which received a Caldecott Honor.