Whether we like a room or not largely depends on the design of the color landscape that we perceive when we enter the room. What is the key? In what direction should I move? What is the light like, and how is the atmosphere? Does the environment have a harmonious effect? Do I want to stay here? The colors in a room provide us with answers to such questions. Color is a subject that is as fascinating as it is multifaceted; it is a subject that can only be understood in context – function and emotion, light and shadow, language and material. All these factors are presented in a practical guide to color concepts that create a harmonious accord between people, space, color, and light. How can we design built spaces that affect us in an equally beneficial, timeless, and harmonious way as the color landscapes of nature?