1. A computer-implemented method for transforming the visual appearance of a graphical image on a graphic user interface, comprising the steps of: generating the graphical image within a confined display area by way of an electronic display device wherein the graphical image represents a window displayed on the display area; associating a physical material with said graphical image, said physical material defining possible transformations to said graphical image according to at least one physical irregularity associated with said physical material that includes one or more of the following: wood, metal, paper or glass; receiving an input; transforming the visual appearance of said graphical image, responsive to said input and in accordance with the possible transformations defined by the physical material, in a non-uniform manner, to have an appearance of the physical irregularity associated with the physical material, wherein the graphical image is transformed to have the appearance of at least one physical irregularity selected from the group of wood, metal, paper, or glass, and wherein the transformed graphical image is non-uniform with respect to other graphical objects on the display area; and, displaying said non-uniform graphical image on the graphic user interface.