1. At least one digital data storage media tangibly embodying a program of machine-readable instructions executable by a digital data processing apparatus to perform operations to manage an interactive display system including a touch-sensitive display, the operations comprising: establishing a first image comprising subject matter having predefined spatial coordinates; presenting the first image upon the touch-sensitive display; and responsive to prescribed user input including contact with the touch-sensitive display, integrating at least one secondary image comprising subject matter having predefined spatial coordinates into the display of the first image; wherein each point on the touch-sensitive display depicts subject matter having substantially identical spatial coordinates regardless of which of the first and said secondary images is presented at the point.