Actually, I don't need it but a friend wanted to learn how to quilt and there it was on the menu. She looked through it and said "I can do that". She is taking the book, fabric , needle and thread on a 3-day holiday next week. I would have preferred it if the hourglass block was in it, as she liked the look of some in one of my quilts. Also, hourglass is a logical extension of the triangle square.