Roller in hand, a boy starts to paint a blank wall. First it’s a plain coat of pink. Then six birds emerge, perched on a branch. . . . Wait, they were there a minute ago! Then he tries the blue paint, and it happens again: fourteen fish swimming in formation, until green paint reveals a giant dinosaur with big teeth and a mind of its own. Whether gray, yellow, purple, or orange, each spread draws on visual humor and an array of unpredictable animals to yield a bigger surprise, right up to the warm and rewarding finale.