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With the growth in size of the windows and the progressive suppression of the lateral walls of vaulted structures, stained glass came more and more generally into use. It stimulated the increase in the size of windows, and the suppression of the walls, and contributed greatly to the development of <em>tracery</em>. Its evolution can be traced from the simple coupling of twin windows under a single hood-mould or discharging arch (shown here), to the florid network of the fifteenth century.

Plate Tracery, Charlton-on-Oxmore

With the growth in size of the windows and the progressive suppression of the lateral walls of vaulted…