In 1963, Marco Zanuso designed the model 275table lamp for Oluce with its large adjustable rotary Perspex diffuser, fastened to a lacquered metal base. Subsequently renamed Zanuso, the 275 lamp was originally conceived for use as a desk lamp. However, its purpose was not intended as an operational lamp, but rather to illuminate a table in an environment that is not necessarily an office. In fact, its iconic shape finds use not only on desks, but generally on any bearing plane, its primary role being to light a portion of a room.
Table lamp giving diffused light. Opal PMMA diffuser rotating on the base. Painted metal curved support and base.
More information from the supplier see here