The Tiffany windows were designed by Frederick Wilson (1858–1932), Tiffany's chief designer for ecclesiastical windows. He made extensive use of Tiffany's special glassmaking technologies, including confetti glass, iridescent glass, 3D-textured "drapery glass", pastel colors for "painting in glass", and the trademark opalescent “Favrile” glass. There are as many as six or seven layers of glass in a Tiffany window, producing visual textures that would otherwise have to be painted in. Only some fine details impractical to produce in glass were hand-painted, in permanent enamel. The Arlington Street Church holds the complete set of Wilson's original watercolor design drawings for all the windows.