Figure 10

A schematic representation of how successive images of a moving ball, with a wall in the background, may be compressed, with an encoding of the ball’s motion and its speed. Key: T1 to T4—times for the corresponding images; P1 to P4—successive positions of the ball; Blue arrows—each one represents a time interval between one frame and the next, with a past-to-future direction; Red arrows—each one represents the distance travelled by the ball between one frame and the next, with the direction of travel; Bg—a relatively short name or code for the ball, with an associated colour (green); Wr—a relatively short name or code for the wall, with an associated colour (red); ^∗—iteration of the encoding in the envelope.