The table lamp Lucenera 200 by Catellani & Smith was designed according to the form follows function principle. This light consists in a stem that contains a thermoplastic material making it pliable in its middle part. The upper and lower parts of the stem are rigid and made of nickeled steel pieces. Below it is fixed on the square rubber coated base of the lamp whereas above it holds the diffuser of the lucenera or "black light". This diffuser is a cylinder from carbone fiber with a high heat resistance that can be easily shifted along the stem in order to vary the diameter of the light beam from 25 cm to up to 200 cm.With the help of the flexible stem it is by the way possible to direct the light beam as you like it. This light is equipped with a on and off switch.