Sir Christopher Wren designed and built more than 50 church buildings in London during the late 1600s. His design style had two prominent features—the first of which was sturdy, tall steeples. The second, however, was more profound. Wren was convinced that all of the windows in his churches must use clear glass as opposed to the stained glass so popular in churches of that era. In part, his reason for the clear glass is found in words attributed to him: “God’s greatest gift to man is light.” Allowing light to bathe people as they worshiped was, to Wren, a celebration of that gift.