A delightfully funny story that introduces shapes, size, and camouflage "It's time to go swapping," says Sherman's mom. But finding the right shell is not easy. Mom wants a sensible shell for her young hermit crab. But Sherman wants one that's spiky and cool. While they're looking, a curious human scoops Sherman up for a closer look. Luckily, he finds a shell in time to protect him. Of course, as he points out, he would never have been in danger if Mom had let him decorate his shell with anemones.