The Art of Stained Glass in the Worship of God

Thank you Mr. Goldman for the suggestion

Bottle Store, Jonathan: Since ancient times people have been using colored, cut glass in designs and in windows. Evidence of this is found in both Roman and Egyptian eras. Prior to 313 A.D., colored glass was primarily used as a decoration in wealthier homes. However, when Constantine allowed Christians to worship, and when they began to build churches, colored glass windows became part of the beautiful decorations. Stained glass became more common during the Middle Ages in cathedrals. More here with many links about stained glass.