Harold and the Purple Crayon
Harold and the Purple Crayon is a 1955 children's picture book written and illustrated by Crockett Johnson. Published by HarperCollins Publishers, it is Johnson's most popular book, with more than 5 and a half million copies sold and being translated into more than 14 languages, it has led to a series of other related books, as well as many adaptations.
Source: Wikipedia — Harold and the Purple Crayon (CC BY-SA 4.0)