What Makes a Rainbow? (Lap Book Edition). Giant board book for young children, with magic ribbons that appear with the turn of each page. Giant lap book edition measures 9x12 inches closed, 18x12 inches open. This brightly illustrated board book teaches children about colors. Each page of the book features a different color and magic ribbons. What Makes a Rainbow? board book is made from high quality materials (hard cover binding). This easy to read, richly illustrated book will introduce young children to the joys of books and reading!