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When Triangle breaks the rule about not hiding behind the waterfall while playing hide-and-seek with Circle and Square, Circle must rescue him.

This book is about Circle. This book is also about Circle's friends, Triangle and Square. Also it is about a rule that Circle makes, and how she has to rescue Triangle when he breaks that rule. With their usual pitch-perfect pacing and subtle, sharp wit, Mac Barnett and Jon Klassen come full circle in the third and final chapter of their clever shapes trilogy.

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. Mac Barnett lives in Oakland, California. 

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