A simple book—two books in one that end in the middle—with a salubrious message: ``Sometimes, you just feel happy'' and ``Sometimes, you just feel sad.'' In the first half of this book a troop of animals savors its happiness—a peacock parades while a tiger is tickled. In the other half, which must be flipped over to be read, a collection of beasts fares less well—a bear broods and a camel curls its lip. This companion to Wide Awake/So Sleepy (1994, not reviewed), with some inventive anthropomorpization, lets children know that it's okay to go with the flow. Paschkis's colorful portraits display a whimsical use of perspective and amiable animals who are expressive without being cute; the background patterns bloom in a robust palette. (Picture book. 2-4)