A gaming apparatus may include a primary display unit, a value input device, a first controller coupled to the primary display unit and the value input device, a microprocessor and associated memory, and a second display unit. The secondary display unit may include a viewing window, a first object coupled to a movable member, and a second object. The secondary display unit may also include a semitransparent mirror positioned to reflect an image of either of the first or second objects and to transmit an image of the other object, such that both objects are viewable through the viewing window. The secondary display unit may additionally include a motor coupled to the movable member to move the first object such that a depth of the image of the first object changes relative to a depth of the image of the second object as viewed through the viewing window.