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 creator of the #1
New York Times bestselling
I Want My Hat Back, which received a Theodor Seuss Geisel Honor, and its companions,
This Is Not My Hat, which won a Caldecott Medal and a Kate Greenaway Medal, and
We Found a Hat, named a
Publishers Weekly Best Children’s Book of the Year. He is also the creator of the Your Places and Your Things board book series, as well as the picture books
The Rock from the Sky and
The Skull. He is the illustrator of
How Does Santa Go Down the Chimney?,
Extra Yarn,
Sam and Dave Dig a Hole, and the Shapes Trilogy, all by Mac Barnett. For his contributions to children’s literature, Jon Klassen is a member of the Order of Canada and was named the 2026 recipient of the Astrid Lindgren Memorial Award. Originally from Niagara Falls, Ontario, Jon Klassen now lives in Los Angeles.
Square’s efforts to please are equal parts hilarious and cringeworthy, and the moment he topples over in exhaustion is
comic gold. The story’s decidedly ambiguous conclusion leaves the door open for questions about what it means to be an artist—and that’s the whole point.
—Publishers Weekly (starred review)
This book takes
a sweeter turn from its prankish predecessor in that Square works hard to create something for Circle, only to feel like he failed; but when Circle sees what he created, she is “beguiled” once more by his genius. Though this title will stand alone, children familiar with Triangle might recognize the extra layer of humor at the end when an unnamed narrator poses a game-changer of a question.
A must purchase that will satisfy old fans and create new ones.
—School Library Journal (starred review)
Funny and lightly philosophical, Barnett’s story gets an extra punch of hilarity with Klassen’s minimalist graphite-and-watercolor artwork. A must for Triangle fans that will leave them wondering how this geometric drama will end.
—Booklist
With typically deceptive minimalism Klassen places a few flat, blocky shapes on the white pages to suggest the physical landscape, angling Square's body and glance to convey the emotional one.
Humor is in the details: a bit of twig that catches on harried Square's head and stays there; the shadow that appears beneath Circle as she floats along through the air. For all its brevity, chockablock with philosophical topics to ponder and debate.
—Kirkus Reviews
Barnett’s text is funny and profound, raising philosophical questions about intent, genius, and truth. Klassen’s trademark eyes do a lot of emotive work amid the spare, fantastical set- ting. Angled lines (in the rocks, plants, and slanting rain) and white space direct readers’ own eyes across each page or spread, and short sentences, smart dialogue, and word repetition keep the story moving at a steady pace. Readers looking for a
compelling read-aloud will not be disappointed.
—The Horn Book
There’s a ’60s flair to this
story of friendship and artistry; the text is spare yet robust, with a lot of meaning behind the carefully selected words, and the open-ended conclusion will give kids much to discuss. Klassen’s watercolor, graphite, and digital art is animation ready, with simple textured shapes against white backgrounds...While the story could provoke discussions about expectations and friendships, this title is most at home as an original entry in art curricula.
—Bulletin of the Center for Children's Books
Square attempts to make a Circle sculpture that will be as perfect as his friend is...Children will no doubt find the results
hilarious. The droll illustrations by the Niagara Falls, Ont., native Klassen, in subtle shades of gray, brown and blue, endow these friends with personality and Barnett's simple text is perfect.
—The Buffalo News
Droll, subdued and enigmatic, this second volume of a planned trilogy will delight children ages 5-9.”
—The Wall Street Journal
