Student 1 arranges his boxes in a configuration which is screened by the folder to prevent Student 2 from seeing. Student 2 listens and follows directions as well as possible. When Student 1 has finished, Student 2 may ask two questions. Then the screen is lifted and Student 2 gets to check her accuracy against Student 1's model. Student 1 and 2 then take turns in both roles of the above game.
Teacher explains the game by means of demonstration with a student.