Baroque windows have symmetrical casements and small panes of cylinder glass or crown glass. The characteristic, round mullion resembles the stone mullions of the Renaissance. The casements are side-hung and hinged with corner hinges.
During the Baroque period, wooden muntins were developed as well as the technique of attaching windowpanes with putty. This was a great improvement as windows with wooden muntins are more closely sealed and do not rattle like lead lights.