Among Alvaro Siza and Adolf Loos there is an affinity that is based on neoclassical common vocation. The "almost nothing" is the Loos figure that recurs in the projects developed by Alvaro Siza too. Extreme synthesis even in this Meteorology Service Building with a circular plan and a cylindrical shape for a six floors structure with a diameter of 33 meters, it functions as a sort of kaleidoscopic labyrinth