It's Jack the pup's birthday, and like any inquisitive youngster, he's trying to guess his presents' contents by their shapes. Readers have it easy--the triangle-shaped package is a toy sailboat, while the easy-to-predict gift is a ball. It's all illustrated in bright colors and heavy, easy-to-see black outlines. A bold pop-up ends the tale, displaying a tableau of Jack and relevant objects, plus a key to help toddlers identify things by color and shape. Fun until the flaps wear off, which they may from the repeated work-outs this book is certain to enjoy.