Patrick Reyntiens

The stained glass artist Patrick Reyntiens mentions "Claritas":-
".. a quality of visuality which in the Middle Ages has an importance far from being appreciated today. The visual quality of reflection and transparency was an indication of a higher, moral, order, an order which was the beginning of the ultimate reality which, in a word, reflected heaven. It was the most highly prized of medieval visual qualities the main quality sought was one of uplift to the eye and therefore to the spirit, using transparency, translucency and multiple reflection."

Patrick Reyntiens: "The Beauty of Stained Glass" London, 1988