This window replaces an original Gibson window and is done in a different style.  It approximates the pot-glass windows found in early medieval European cathedrals like Chartres.  Glass pieces, each of a single, intense dark color, were assembled like a mosaic, to create patterns and scenes, then leaded together.  There was very little painting on the glass, so much less detail could be shown than on windows like Gibson’s, which were largely achieved by using multiple colors of vitreous enamel paint on clear or white glass.