Il palazzo dell’INPS is an example of rationalist architecture, the buildings were designed by the Milanese architect Giovanni Muzio, and by the Romans Mario Paniconi and Giulio Pediconi in 1939 as "architectural backdrops" for the imperial gate, as part of the broader project of the urban complex for the Universal Exposition of 1942 (cancelled due to war events), the so-called E42 then renamed EUR, an urban and architectural complex in Rome designed in the thirties of the twentieth century for the construction of the headquarters of the Universal Exhibition. This is a detail of the secondary façade, where the geometries of the architecture play with light and shadow. In fact, light plays a fundamental role in architecture as it has the ability to exploit optical-perceptive phenomena, it manages to manipulate "spatial perception" in order to generate sensations for those who experience it. The study of light reveals the architect's task, it is the tool that the designer uses to draw his own ideas, to play with them, in this way he communicates with the viewer who interacts with the space, thus experiencing architecture to the full. In 1923 Le Corbusier had written it in the essay "Towards an Architecture", defining what are the elements that form the volume of architecture and what they manage to form with light: “Architecture is the skilful, rigorous and magnificent play of volumes assembled in light."Our eyes are made to see shapes under light; shadows and lights reveal shapes; cubes, cones, spheres, cylinders or pyramids are the great original shapes that light reveals; their image appears to us clear, tangible, without ambiguity. This is why they are beautiful shapes, the most beautiful shapes." Taken in 2021, Canon EOS 60D, Lens Canon EF-S EF-S 55-250 mm IS II, 1/125s, f/16, ISO 400