Swift and snappy, Oechsli puts an owl on the crescent moon, tumbles children from page to page, throws in a crab with a spyglass, makes words out of animals and sun rays out of words. Where ingenuity falters (Oechsli's style is less than innovative), the high spirits carry you through all the changes from seed to tree, from egg to bee, from farm to town, from summer to fall -- and ""people change the most of all. . . . Everything changes all of the time and that's just fine."" The catch is that by choosing a title identical to Ruth Rea Howell's 1968 book of nature photos Philipson and Oechsli invite comparison with a more revealing treatment of the same theme. . . and for sheer fun there's Pat Hutchins' vastly more inventive Changes (1971) to compete with.