Have students sit back-to-back in pairs with one facing the overhead projection. Have the other student have paper and pencil ready. Place a simple picture on the overhead. The student facing the projected image must explain the picture to the student who can't see it WITHOUT telling them directly the objects in the picture. Also, the student looking at the projection cannot look at what their partner is drawing. They need to explain the lines and directions of the lines, and where it is on the paper to the other student. The object is to get as close as they can to the projected image.