In the medieval period, as well as since the start of Christian history, the light if at the outset binds to the origin and the holy ghost of the things, concept this very observed in the gtica illumination, that possesss its cathedrals as great prominences of the medieval period, despertando the religiosidade through the upright of the natural light. Bruyne (1958) affirms that the light in the medieval period always inhabits above of the expression forms, where the extreme visible beauty to the eyes is conceived had to the consequence of the beauty invisible superior. The author emphasizes the element that more characterizes the gtico: the vitrais, used in the points highest of the cathedrals. The vitral is an element of the gtica architecture that goes beyond the functional and structural aspect, a time that was had at the time as the effect of the transmutao of the substance, of the rock, through the light. According to medievos, the power of the divine light could transform the hard rock into difana substance, an intermediary between the terrena corporeidade and the transcendental form. The form architectural of the gtico is characterized in such a way by the luminosity how much for the upright. (BRUYNE, 1958, V.3.).
Still according to author, is necessary to interpret the light in the medieval architecture not under the setecentista prism, but yes under the point of view where the supernatural one was present in all and any activity human being. to obtain the idea of the supernatural one in the architecture was used the resource of the upright, possible thanks to the effect of the glass.
