Chartres Cathedral of Notre-Dame

In Chartres Cathedral of Notre-Dame (Figs. 17-4 through 17-11), light is used to convey spiritual meaning. In a 1-2 page essay, describe at least two elements of form and/or content (materials, iconography, composition) that use light to convey spiritual meaning. How did the artist or designer use these elements of forms and/or content to convey spiritual meaning? Then, use at least two examples of specific, contextual evidence (site, intended audience, historical and cultural environment) to explain why light was used to convey spiritual meaning.