Abstract: A method and apparatus displays a plurality of representations of an environment. The method includes the steps of (a) providing an object structure having a first branch of object data structures that defines a first domain of the environment, a second branch of object data structures that defines a second domain of the environment, both a first object data structure of the first branch and a second object data structure of the second branching defining a particular article in the environment; (b) displaying a first graphical image defined by the first object data structure; (c) changing a feature of the first object data structure; (d) automatically notifying the second object data structure; and (e) displaying a second graphical image defined by the second object data structure, the second graphical image providing an indication of a feature change of the first object data structure.