...La voûte de la chapelle supérieure du transsept sud de la cathédrale de Laon nous présente une de ces clefs entourée de feuilles finement sculptées et peintes; du côté de l'angle le plus ouvert, comme dans l'exemple précédent, les feuillages s'échappent de la rosace centrale, s'entrelacent et viennent garnir la rencontre des deux premiers arcs. Nous donnons (5) cette jolie clef...

This image comes from Dictionary of French Architecture from 11th to 16th Century (1856) by Eugène Viollet-le-Duc (1814-1879).

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