Systems disclosed herein provide objects that are capable of altering a configuration of touch points in contact with a surface of a touch-sensitive system. In one embodiment, an object includes an outer member, an intermediate member, and an inner member. The outer member has an opening between a top surface and a bottom surface. The intermediate member has an opening between a top surface and a bottom surface, where the intermediate member fits within the opening of the outer member. The inner member fits within the opening of the intermediate member and has a bottom surface. The bottom surface of each of the members includes a touch point. A contact with the surface for each touch point is coplanar when the members are fit together. Further, the configuration of touch points in contact with the surface defines an identifier for the object to the touch-sensitive system.