Hi Hexiao, that is a great question. Lighting double-height or vaulted spaces can be tricky. In this case we used a clean and simple stainless steel track with small track head spotlights, attached on both sides of the room directly on the sloped ceiling. This provides indirect and ambient light, which is supplemented by two wall sconces and some flush mounts in the hallway (can see these in the photo.) Additionally there is a table lamp which provides illumination for reading at night.
Tamara Heather Interior Design, LLC