A thick black line speaks to the young listener in rhyme as it becomes a circle, a square, a crooked line, an arc, a triangle, an oval, and a wavy line. The purpose of the book is to familiarize the child with shapes of things he sees. The author's intent is not carried out successfully; injecting ""forms"" like wavy lines only tends to confuse, rather than enlighten, since these lines (crooked, wavy, etc.) are not accepted forms. Some of the illustrations are clear (though not very artistic); others distort the idea of seeing a specific form in the world of nature. In order to fulfill her original goal, the author's rhymes would have had to be memory-joggers--the young listener will not remember the definitions because the verses are too bumpy.