The major transit hubs (airports, large stations, subways) and many public infrastructures in large urban developments of the twenty-first century don’t always guarantee a steady or sufficient relationship with natural light and with the experience of the openness - often because they are underground or because the open zones are interrupted and lost in the crossing of massive indoor volumes. Millions of people experience these places, as many as others who work there. By having installed different samples of this innovative system in airports, transit areas and cultural hubs, CoeLux® can transform the experience of these spaces, turning them into a natural place, where the sun and the colour of the sky join and improve their perception and use. From efficient and conservative natural lighting cast on works of art and onto long hours of transit in an airport: the science of CoeLux® brings sunshine and a blue sky where is missing.