Given the following passage "In some design instances, materials used on walls and furniture play a key role in the lighting effect< for example dark paint tends to absorb light, making the room appear smaller and more dim than it is, whereas light paint does the opposite. In addition to paint, reflective surfaces also have an effect on lighting design.", answer the following question. Note that the answer is present within the text. Question: What are they using light and dark paint for
A:
lighting design