The stained glass in chartres cathedral reflected the new gothic focus on light and geometry.
The chartres cathedral is known not only for its architectural upheaval, but also for its various sculptures and acclaimed stained glass windows. The primary function of those windows was to fill the inside space with mystical colored light describing the Holy Spirit and to explain the biblical story to the majority of the believers who could not read. More light was captured through the grisaille glass, and the stained glass became more detailed, slowly resembling a painting over the Gothic period. Much of the original glass was destroyed in the post-medieval centuries but now been restored.
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