An imaginative picture-book rendition of the idea of a shadow as a child's constant companion. A small Oriental boy, a city dweller, considers his shadow a special friend who follows him around town, to the park, to the beach. Like Stevenson's famous shadow companion, his size varies and he goes away at night--but in this case not quite. In Narahashi's clean, beautifully patterned watercolors, he becomes an evanescent dark shape, to be reborn tomorrow as ""yesterday's night left behind for the day."" The spare text is outshone by the glowing illustrations, where a starkly black dog and a Siamese-marked cat appear on most pages and the sinuous blue-violet shadow sometimes dances away on a spooky life of its own. A fine addition to the concept book shelf.