sentences:  More interesting is the case when the inclination degrees of layer lines are not the same for the base and revealing layers.Figure 7 shows an animation of a superposition images where the inclination degree of base layer lines is constant (10 degrees), but the inclination of the revealing layer lines oscillates between 5 and 15 degrees.The periods of layers along the vertical axis "p"b and "p"r are the same all the time.