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Jessica Gelt visited Klassen in his studio and learned why the Caldecott Award winner’s books are so beloved by children.

Librarians issued warnings—"It is not a book to be left where a sensitive child might come upon it at twilight," one worried—and Sendak won the much-coveted Caldecott Award for the book in 1964.

Chris Raschka's "A Ball for Daisy" won the Randolph Caldecott award for best illustrated story.

In 1963, the same year that Madeleine L’Engle won the Newbery for “A Wrinkle in Time,” “The Snowy Day” won the Caldecott Award for the most distinguished picture book.

Then Allegorist Bemelmans proudly displayed the Caldecott Award, which the unsuspecting American Library Association had just bestowed on Madeline as the best children's book of the year.