In the cathedral of Chartres in France one of the elements most fascinating of the gtica art is found, the vitrais. It is important to stand out that Chartres if detaches for being the only medieval cathedral still to conserve great part of its original vitrais. Tree of Jess, produced in century XI enters the vitrais of Chartres is distinguished it enters the years of 1140 and 1150, that it consists of the representation of the genealogy of Jesus Christ through a family tree, projected one in one of the windows of the cathedral. The vitrais are composites for small fragmentos of colorful glasses forming in the windows a mosaic with diverse colors that symbolically translate the light of the Espirito Santo flooding the interior of the cathedral for a calm clarity and multicolorful, with the pretension to create an inspired environment and to take the expectador to contemplate the deity. The specialization of the hand is noticed in the artistic production of these vitrais of workmanship that started to appear in the Decrease Average Age. First it was necessary to melt the glass adding chemical elements to color to become it translucent; after they were made use the way of plates that after cooled were cut with a diamond tip in the preset format, in order to construct the break-head.
But some details were painted the hand; after that these plates were made use of form if to incase one in the others, through a metallic frame call of ' ' profile of chumbo' '. These joined plates would form the great compositions of the windows, the vitrais. In the case of the vitral Tree of Jess the vertical format of the window if adaptou well to the considered subject that was to represent the family tree of Christ from Jess, deriving of the ancestry of the tribe of Jud.