Passive solar design minimizes energy use by saving energy through the use of solar technology. Technology like this poses new opportunities for saving money on bills and it helps conserve energy. Lighting is a technological advance itself. Lighting is functional and can also be aesthetically pleasing. For example, Christmas lights are decorative as well as lamps. Light changes the color or look of things. Natural light vs artificial light will have a different color to it and therefore objects in a room may look a different color.