The light on the front window is held on by a 90° 1x1x1 brick (name suggested to me: 1x1 side-stud brick). The 1x1x1 brick is attached to a 1x2 center stud plate. The center stud plate is attached to two more 1x1 side-stud bricks. Those bicks are connected to the floor by a 1x2 brick.