Triangle (The Shapes Trilogy). This item is unavailable.Triangle (The Shapes Trilogy)

Part of the Shapes Trilogy, the books that inspired Shape Island from Apple TV+

Multi-award-winning, New York Times best-selling duo Mac Barnett and Jon Klassen conspire again on a slyly funny tale about some very sneaky shapes.

Meet Triangle. He is going to play a sneaky trick on his friend, Square. Or so Triangle thinks. . . . With this first tale in a new trilogy, partners in crime Mac Barnett and Jon Klassen will have readers wondering just who they can trust in a richly imagined world of shapes. Visually stunning and full of wry humor, here is a perfectly paced treat that could come only from the minds of two of today's most irreverent -- and talented -- picture book creators.

Mac Barnett, the 2025-2026 National Ambassador for Young People's Literature, is a New York Times best-selling author of stories for children. His work has been translated into more than thirty languages and sold more than five million copies worldwide. Mac Barnett's books have won many prizes, including two Caldecott Honors, three New York Times/ New York Public Library Best Illustrated Children's Book Awards, three E. B. White Read-Aloud Awards, the Boston Globe-Horn Book Award, Germany's Jugendliteraturpreis, China's Chen Bochui International Children's Literature Award, the Netherlands' Zilveren Griffel, and Italy's Premio Orbil. He is the cocreator, with Jon Klassen, of the Substack Looking at Picture Books, as well as Shape Island, a stop-motion animated series on Apple TV+, based on their best-selling Shapes series of picture books. Mac Barnett lives in Oakland, California.

Jon Klassen is the author-illustrator of I Want My Hat Back, a Theodor Seuss Geisel Honor Book; This Is Not My Hat, winner of the Caldecott Medal and the Kate Greenaway Medal; and We Found a Hat. He is also the illustrator of two Caldecott Honor Books, Sam and Dave Dig a Hole and Extra Yarn, both written by Mac Barnett. Jon Klassen lives in Los Angeles.