More of Tana Hoban's Shapes and Things, paired this time to illustrate the concept of opposites. A turtle's head is photographed in and out of its shell, and a vegetable basket is at first empty, then full of mushrooms; together and apart are neatly demonstrated by the wooden pieces of a jigsaw puzzle, whole and broken by two luminously perfect, then palpably viscous eggs — and so on with Hoban's usual stunning effects.