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＂This book is about Circle. This book is also about Circles 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.＂--

Mac Barnett is the author of many picture books including Chloe and the Lion and Guess Again! which TIME Magazine named the number 2 Picture Book of the year. He also writes the Brixton Brothers series of mysteries. Two of his collaborations with Jon Klassen, Extra Yarn and Sam and Dave Dig a Hole have won the Caldecott Honor. He is also the author of The Shape Trilogy, illustrated by Jon Klassen, A Polar Bear in the Snow, illustrated by Shawn Harris and Twenty Questions, illustrated by Christian Robinson. He lives in California, USA.

Jon Klassen is the creator of the New York Times bestseller I Want My Hat Back, which was named a Theodor Seuss Geisel Honor Book, a New York Times Book Review Best Illustrated Children’s Book of the Year, and a Publishers Weekly Best Children’s Book of the Year. He returned with another hat and another thief in This Is Not My Hat, which won the Caldecott Medal and became a New York Times bestseller.