One day, Triangle walked through the door and out of the house. He was going to play a brave trick on Square.

The Triangle passed small triangles, medium triangles, and big triangles. Until he reached Square's house and said "SSSSSSS", like a snake. And Square was afraid of snakes.

This is the first album in a trilogy of shapes ("Triangle", "Square" and "Circle") created for little ones by the talented and acclaimed Jon Klassen and Mac Barnett.