Light, or the visible spectrum of radiation, is a fundamental element of our lives here on earth. Light is necessary for vision, photosynthesis, and the growth of living organisms. It is no accident that life on earth requires these light frequencies for optimal growth and development. At the source of light energy is the sun. Sunlight is essentially a random mixture of different light frequencies, with a spectrum ranging from ultraviolet to infrared. While the sun is our primary source of light energy, we have the ability to control the frequency, intensity, and color of light in our environment. Light can be used to give a space character, identity, and purpose. We rely on lighting to provide task lighting in a work environment, to set a mood in a living space, and to add visual interest and substance to a space. With the help of digital technology, lighting can be designed to respond to its environment and to communicate its message. Light can be used to highlight a chosen area, or to hide something from view. Light can lead the eye to a chosen destination, and it can help to establish a sense of depth and space. It can also be used to create a sense of balance between the functional and emotional aspects of a space. Light is a powerful tool for documenting and creating a sense of place. Architects, designers, and photographers have used light to shape and construct their ideal environment, and this same light is made available to us to explore and appreciate the beauty of the world around us.