In elementary school classrooms across the United States, desks are usually clustered for collaboration and the walls are teaching spaces covered with learning materials and students’ work. Teachers move around the room, often working with small groups while the rest study independently. In U.S. high schools, on the other hand, there is more teacher-centered instruction involving the whole class. Yet learning styles developed in earlier grades still shape interactions between student and teacher, and collaboration is common, especially on projects.