"Light is not only an amount of energy," says Marilyne Andersen of MIT’s Department of Architecture. "It also provides us with the means to reveal spaces and volumes and interact with our environment." Andersen and others in the Building Technology Program have been working on how to better incorporate natural light into building design, recognising that natural light has many positive effects – including considerable financial savings in energy bills as well as benefits for occupants’ health and wellbeing. According to their findings, natural light improves mood and health by regulating human circadian rhythms, for instance. “Natural light is one of our biological needs. Intuitively, we prefer daylight to electric light,” she says.