Little Triangle has no one to play with; he is very lonely. He sets out to find the perfect friend. First he meets Little Circle, but the circle is too busy being perfectly round to be friends. But then Little Triangle meets Little Square. Can the two shapes get along? They disagree on what makes the perfect shape, but maybe if they work together, they can make something special and be perfect friends forever. Little Triangle introduces young readers to the basic concepts of geometry through artistically creative, rich, and colorful 3-D illustrations, created collaboratively using various elements and media by author Isabella Grossman and interns at her studio.