There are 3 books in the Shape Trilogy series. The newest book is Circle which came out in 2019.

1
Triangle

By Mac Barnett , Jon Klassen (illustrator) ,

Book cover of Triangle

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

"Picture book lovers will find much to like in Triangle" Guardian

From the award-winning team behind Sam and Dave Dig a Hole, and illustrated by Jon Klassen, the Kate Greenaway-winning…

When you buy books, we may earn a commission that helps keep our lights on (or join the rebellion as a member).

2
Square

By Mac Barnett , Jon Klassen (illustrator) ,

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

The beguiling second entry in the innovative shape trilogy by multi-award-winning, New York Times best-selling duo Mac Barnett and Jon Klassen.

This book is about Square. Square spends every day taking blocks from a pile below…

3
Circle

By Mac Barnett , Jon Klassen (illustrator) ,

Book cover of Circle

From the dynamic, dream team of Jon Klassen and Mac Barnett comes the final instalment in the hilarious shape trilogy.

"Simple shapes and succinct story express big ideas. Makes us consider fear of strangers, the power of the imagination, being brave and standing by friends" Sunday Times

Triangle and Square…