The great merit of a project that has the well used light is that one that obtains to modify the quality of the space when creating a new atmosphere by means of the light. Unwin (2003) says that in the process of the project architectural some types of materials are used. Materials ' ' estveis' ' bricks, concrete, glasses, etc.? material ' ' instveis' ' light, sound, temperature, odor, etc.? that they influence in the perception of the textures, colors, sizes and in the changeable effect with to pass of the time. Some contend that Author shows great expertise in this. even so these elements ' ' instveis' ' they are considered of more difficult domain, a time thought as ' ' matria' ' , they can be controlled in agreement the intention of the architect. Being natural light one of the elements ' ' instveis' ' of the architecture, Barnab (2007) concludes that it can be one of the lines of direction of project in the identification and characterization of specific places: places with low luminosity, gradual luminosity, dark with beams of dramatical light, or places strong illuminated. Still according to author, the luminous substance can evidence the architecture, facilitate to the actions of the people becoming the comfortable spaces, modifying the vision of the volumetria of the environment when modifying the three dimensions of the architecture.
Other components related to the light are the shades and through them it is possible to perceive the tridimensionalidade of objects, conferring to the environment a magic that of another form is not gotten. Thus, we will initiate this boarding on the historical briefing of the Illumination in the Architecture with the Medieval Period. Analyzing the light in the romantic architecture, Alcaide (1985) affirms that the constructive system of the period was marked by compact and continuous walls, where the vain ones that they confided obtained to fulfill an illumination function mere objective.