In chapter 4 McCloud mostly talks about the ideas of time and motion. He specifically makes reference to ways that a comics can give the psychology of time passing within a single image. In doing this, a larger message can be presented within a single image instead of 3 images. By adding lines that precede the object's movement, the message of movement is directed to the viewer in a non-distracting way. He also explains the polyptych in which a moving figure or figures is placed in front of a continuous background allowing for a single large background to be created from the combined images. I think the major point that McCloud is trying to make is to recognize the different ways time can be expressed but also that time is in the head of the viewer when it comes to comics.