Natural light in design is critical. Being aware of the sun and its angles can make a design sing. However, nearly as critical is having a keen sense of good artificial lighting. Beautiful architecture can fall flat once the sun sets without the creative use of well-planned lighting. Architects and designers have been acutely aware of this since Edison invented the lightbulb. Lighting has been used to bring spaces alive, to create depth and intimacy. It can evoke warmth and comfort. It has been used to bring life to cityscapes and paths through nature.