The determination of the wall color must first consider the orientation of the room. The rooms facing south and east should have sufficient light, and the wall should be in cold tones such as light blue and light green. In the north room, the walls should be in warm tones such as milk yellow. Main. The color of the wall plays a role in supporting the background of the furniture, so it should be used in light tones. In addition, the spacious rooms are decorated with warm colors to avoid the feeling of emptiness; the small rooms are decorated with cool colors, which makes people feel visual. Bigger. Which of the following best meet the basic principles of interior color design. ['South-facing restaurant with light blue walls.', 'North-facing small bedroom with light blue walls.', 'Small study facing east with light green walls.', 'Large west-facing living room with dark blue walls.']