1. A method of controlling a system, comprising: creating or obtaining an image having; overlaying the image with a computer-generated graphic component having associated functionality; coordinating the scale of the image with that of the graphic components; and executing the functionality associated with the graphic component, the action of the graphic component being defined at least in part by its geometric characteristics, the action being performed on a portion of the image, or on an object corresponding to the image, corresponding to the portion overlaid by the graphic component.