When prims are linked together to produce an object the link set refers to the whole object, or the list of primitives that are part of the object. Not all objects are composed of a single linked set. Every set has a single root prim. This root prim is prim number 0, or prim number 1 if it is sat on or attached to an agent. All other prims have local coordinates relative to the root prim. The root prim's rotation and position is applied to all child prims