A ""that's why"" story explains the cracks on a turtle's back with neatness dispatch and some drollery. Mr. Turtle, when his friend Mr. Buzzard comes along with his guitar on his way to a meeting of musicians in the sky, decides to go with him. He has fun watching the cloud supported orchestra but on his way home, inside the guitar, Mr. Turtle falls out and lands on a stone that cracks his back is geometric pattern. Aqua toned pictures by the author show surprised animals.