 Tracery is an architectural solution by which windows (or screens, panels, and vaults) are divided into sections of various proportions by stone "bars" or "ribs" of moulding.Pointed arch windows of Gothic buildings were initially (late 12th–late 13th centuries) lancet windows, a solution typical of the "Early Gothic" or "First Pointed" style and of the "Early English" Gothic.Plate tracery was the first type of tracery to be developed, emerging in the later phase of "Early Gothic" or "First Pointed".