light made solid

Bella Online has a nice introductory article for anyone interested in the history of stained glass. It begins:

Although stained-glass windows were first seen in ancient Rome, the art of using stained glass for windows reached its height during the Middle Ages, where this art form was used for the windows of the magnificent cathedrals of Europe. Much of what we know of the process of making medieval stained-glass windows comes from a text written by a German monk called Theophilus in the thirteenth century who carefully studied the techniques of the various craftsmen who played a role in creating these masterpieces of stained glass.

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