This post contains affiliated links for your convenience. I only write about products I love and all thoughts and opinions expressed are my own. For more information see Legal. SHAPE TRILOGY The Shape Trilogy by best-selling author/illustrator duo Mac Barnett and Job Klassen is made up of three books about a group of shape friends. The books are named after the three shapes respectively, Circle, Square and Triangle. Each shape has their own unique personality. Triangle is mischievous, always playing sneaky…