In either case, the list moves as if it is pasted on the wheel's outer surface, 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.[71][72]