Light in nature is a unique element affecting man completely. The nature of daylight as well as its meanings are examined, to show that both stages decisively determine the application of light within architecture and, moreover, that man still remains capable of controlling that which affects him and generates meanings for him. Unveiling the unconscious, conscious, and applied relations between man and light as inseparable stages, demonstrates how the human can achieve unification with architecture by virtue of light. Light and man meet in space. It is architectural space that provides the only control over natural light and allows light to act upon man in striking perfection. Consequently, inquiring into light will improve the definition of architectural space. Beyond being a mere three-dimensional void or simply the object of imaginations, concepts, intentions, etc., architectural space becomes a new dimension. / M. Arch.