The Greenhouse as a Driver of Sales Particularly with its profile, the fourth-generation BMW 3 Series reinterpreted elements of BMW sedan design. The three-box design was retained (with its clear delineation between the hood, passenger compartment, and trunk). However, the whole greenhouse – in other words, the windshield, the rear and side windows, the pillars separating them, and the car’s roof – was redesigned. Seen from the side, the profile of the roof was given a more pronounced curve. This created more headroom for the passengers in back. The new design changes were a success: With 3,266,885 units sold, the fourth generation of the BMW 3 Series is the top-selling BMW model of all time. CLICK ON THE IMAGES FOR MORE DETAILS Next article Sheer Driving Pleasure Home Circular World Digital Journey Electric Future Freude Models