An apparatus comprises an input device and an actuator. The input device
has an interface portion. The interface portion defines a selectively
adjustable orifice having a range of sizes. The interface portion defines
a plane and a longitudinal axis. An actuator is coupled to the interface
portion of the input device. The actuator is configured to apply a haptic
feedback force inwardly with respect to the longitudinal axis within the
plane to at least three locations of the interface portion when a change
in a size of an object disposed within the interface portion is
sufficient to adjust the size of the orifice.