The character of the object – a tube containing different sets of optics – recalls the lens of a still or movie camera and its manipulation, with the three different segments housing three different light sources:a) ambient light coming from the semiopal methacrylate segment, prismatic internal surface while the external is completly smooth,b) a spotlight focused, from the first head, onto the reading matter or work surface,c) light pointed upwards from the floodlight in the second head.Instead of leading the eye to observe different distances in the way that happens with a telescope or a camera lens, the function of the lamp is obviously to bring the light sources to bear on objects at different distances, illuminating them properly by establishing the focal ratios best suited to each situation.