Abstract: The invention is related to a system for interacting with a display through a display window, comprising a recording unit configured to be placed behind the display window for recording a pointer object in front of said display window, at least one deflection unit configured to direct a beam path from a space in front of the display window to said recording unit, a computer unit configured to be connected to said recording unit for determining a position of the pointer object with respect to the display window, and shield means by means of which beam paths that are not deflected by the deflection unit are suppressed, and to a corresponding method. The invention achieves a good contrast between the pointer object and the background and therefore an improved recognition of the pointer object.