1. A computer implemented method for modifying objects in a virtual universe, the computer implemented method comprising: responsive to detecting a presence of a set of avatars within a viewable field of an object, determining a real world identity of a set of users controlling the set of avatars; receiving user information describing characteristics of the set of users from a set of user information sources based on the real world identity of each user in the set of users; generating a temporary and dynamic rule to control modification of the object based on the user information; and modifying the object in accordance with the temporary and dynamic rule to increase visibility of the object to an avatar in the set of avatars, wherein the temporary and dynamic rule initiates implementation of a set of geometric and texture modifications for dynamically modifying the object in accordance with the temporary and dynamic rule.