Trinity in glass

Apparently all attempts to simplify the doctrine of the Trinity are heretical - and I wonder if anyone managed to convince Swiftmidges that they had the solution today - but does that also go for visual images? Heretical or no, two of the eastern windows of Holy Trinity Church, Dunoon, have at the top of them that strange rounded triangle, which I stared at for years without knowing what they represented. But then I found out, and as it's Trinity Sunday I'm going to plough on ...

If you had binoculars, or were up a ladder, you might see that the central orange sphere contains the word Deus. The three arranged round the points of the triangle say Pater, Filius, Spiritus Sanctus - though I think the last must be abbreviated. The short legs radiating out from the centre all contain the word est - is - and the three sections of the rim the words non est - is not.

So, as we sit and gaze vacantly or otherwise at the windows, we are constantly reminded of the doctrine of the Trinity. 

Right?