the Forster team developed a contemporary new version of a historical model, which met both the client's and preservation-related requirements. Windows with complex functionality The forster unico steel [...] or renovating existing buildings. - Products: Box window with integrated daylight control – forster unico HI Daylight system: Köster Lichtplanung, Frankfurt am Main Light-deflecting slats: RETROSolar [...] original facade. As part of the facade renovation, around 500 horizontally pivoted windows with Forster steel profile systems were used, which were developed by an interdisciplinary team as functional