A window in Merton College chapel has three lights: with a circle in the head containing six sex-foils.
Broughton, Oxon, has in the head of one of its windows a circle, containing two intersecting equilateral triangles, the six apices, and six spaces around, being tre-foiled.
{xciv}
The east end of Lincoln, though far inferior to the south transept of Chichester, is nevertheless highly symbolical. The east window of each of the aisles has three lights, with three foliated circles, disposed triangle-wise in the head. The great east window has eight lights in two divisions, each whereof has three foliated circles in the head: and in the apex of the window is a circle containing seven foliations. The upper window has a circle of eight foliations in the head: and in the apex of the gable is an equilateral trefoil.
The next element introduced was the consideration of the Six Attributes of the Deity. One of the simplest examples was to be found in the west window of the north aisle of S. Nicholas, at Guildford: a plain circle, containing six tre-foils: these are arranged in two tri-angles, each containing three tre-foils, and the two sets are varied.
The clerestory of Lichfield cathedral (circ. 1300), is a series of spherical tri-angles, each containing three tre-foils.
A similar clerestory occurs in the north-west transept of Hereford cathedral, and the same idea is repeated in its triforium: a series of three tre-foiled lights, with three circles in the head.
The east end of Lichfield symbolises most strikingly the same glorious doctrine. The apse is tri-gonal: the windows of each side are the same: each is of three lights, with six tre-foils (emblematical of the six attributes) disposed above in the form of an equilateral tri-angle.
The east end of Chichester is rather earlier, but introduces yet another element. Here we have a triplet: and at some height above it, a wheel-window of seven circles: symbolising therefore eternity and perfection.
{xcv}