Changes

Compile and run the application and touch the display. As the touch is moved, note that the blue box view moves as though tethered to the touch point. Move the touch such that the blue and red boxes collide and observe that the red box will move in response to the collision whilst the blue box will rotate on the attachment point as illustrated in Figure 55-2:

[[Image:uikit_dynamics_anchor_point.png|A UIKit Dynamics Anchor Point in action]]