The importance of incorporating daylight or faux natural lighting into building design is recognized by all those involved in developing buildings that focus on the well-being of their inhabitants. Having evolved in daylight for over 150,000 years, the phenomenon of people spending large amounts of time indoors, beneath artificial light, is – in evolutionary terms – very recent as it wasn’t until the Industrial Revolution some 150 years ago that humans could transform night into day with the flick of a switch. Light delivers the perfect combination of the right illumination and spectral content at the proper time. On a beautiful cloudless day, sunlight provides 100,000 lux, and even a very dull, cloudy, and rainy day still provides 2,000 lux, yet indoor light levels, especially in windowless environments, are generally a quarter of this or less which can cause feelings of sadness, lack of energy, loss of interest in usual activities, oversleeping and weight gain. Architects, designers, and planners need to provide daylight throughout the interior. There are three key benefits of light on human life: visual, allowing us to see small details and experience the world around us; emotional, providing a sense of belonging, feelings of safety, and fostering connections; and biological, regulating our circadian rhythm and influencing our mental functioning. The crucial factor is that these three benefits are intertwined and can all be achieved with lighting through Artificial Sky.