FINESTRA is made up of two layers of alabaster glued on laminated glass that form a hollow where high-efficiency fluorescent tubes are arranged to illuminate the interior of the building at night, like large luminaires, while at the same time allowing light to pass through during the day, designed for the monumental complex of the churches of Terrassa, it ensures that the same angle of incidence of light is maintained, thus maintaining the light-shadow relationship in the spaces.