The principle behind the design of this door, which is flush with the wall, is a seamless transition from the wall to the door frame and door leaf. The door frames are individually manufactured to match the thickness of the walls and their internal rim width is derived from the built-in door frame measurements. Thus, they can be installed exactly flush with the wall. The result is a unified surface with a smooth appearance which, with its clear minimalism, supports to the total effect of a room, or, on the other hand, with a compact door leaf, can create a strong accent in an interior.