"What in the world comes one by one?" begins this delightful, rhythmic book about finding numbers in nature by Nancy Raines Day (Way Down Below Deep; Piecing Earth & Sky Together). The answer is: "A nose./ A mouth./ The moon./ The sun." "What in the world comes two by two?" "A pair of birds with wings of blue." Threes? "Leaves of a clover, bodies of bees." Four by four? "Petals of poppies, hooves--and more." Five by five? "The arms of sea stars, all alive." It's always exciting to come across a book that offers up a new perspective on the world, and the beautiful, expansive compositions of Kurt Cyrus (Lisa Wheeler's Mammoths on the Move, Tadpole Rex) reflect Day's contagious awe of nature and its numbers. --Karin Snelson, children's editor, Shelf Awareness