In this case, there is only two-way ambient light for this old apartment. To consider the ambient light defects of the building, the designer takes artificial light as the leading role. He uses projection lights to complement interior light. Besides, flowing gleams from the gaps on the ceiling to the walls by specific design soften the interior space. The designer utilizes the inside-entrance, which is only for big houses, in this small but open one. Glass inside-entrance creates the sense of visual penetration and the function of a suspension line to become the boundary between the common and the private area.