This clips shows and explains the progression of a thinking machine, an invention to aid in teaching. A voice over narrator talks. It begins with an EXT of a college building. Fades to a close up of the machine with hands pressing its buttons. A CU of a photograph of Sidney Pressey, the inventor. Returns to a CU of the machine. Cuts to a CU of a hand taking a small white marble from the machine. A CU of one of his earlier machines. Fades to a CU of another machine. A CU of a reel to reel projector turning on and playing. Fades to a CU of another projector. Fades to a man writing on an overhead projector. Fades to a CU of a tape recorder. A zooming shot of a man putting an information strip into a machine. Fades into a montage of various children using the machine. A MS of Sidney Pressey talking about his machine in front of a group of students.