Scrolling through a long list or menu is achieved by sliding a finger over the display from bottom to top, or vice versa to go back. In either case, the list moves as if it is pasted on the outer surface of a wheel, slowly decelerating as if affected by friction. In this way, the interface simulates the physics of a real object. Unlike previous scrollable views, in which the user pressed a "down" control to move the view "downwards", on iOS the user pushes "upwards", as if moving a "plank of wood floating on the water", creating the impression that the user is directly manipulating the content displayed on the screen.