Mr. Guthrie greeted Katie Carew as she walked into her classroom on Monday morning. “All fish travel in schools. This is right where you belong.” “But I’m not a fish . . .” Katie started to say. Then she stopped herself. As she looked around she saw that her classroom had turned into some sort of underwater world. Of course, Katie wasn’t really underwater. Mr. G. had just decorated the classroom to make it look like a giant aquarium. Her teacher was always doing things like that. “Let me guess, we’re studying fish now,” Andy Epstein said. “You’re a wise little guppy,” Mr. G. told him. Katie looked around the room. Mr. G. sure had worked hard. The walls were lined with giant photographs of fish and coral. The floor was covered with a sea green carpet. There were fish-shaped balloons hanging from the ceiling. Mr. G. had even surrounded Slinky’s cage with blue and green streamers. It looked as though Slinky were a sea snake, instead of a snake who was the class pet.