A V-form with distinctive sides inclined towards the outside enlarges the lighting and ventilation surfaces by 125 per cent compared to conventional constructions. Shading, which is dimmed via a wall-mounted control switch, is integrated in the thermal insulation glass. Also the ventilation can be conveniently operated by remote control, smartphone or tablet. With clear separation, vertically mounted connections and a flat construction give the window the appearance of floating over the rooftop and blend in functionally with their surroundings.