Lierne (vault)

In France, examples occur in Flamboyant architecture, such as in the Church of Saint-Pierre in Caen.

The vault-plan diagram of Ely Choir shows the ribs as double lines.

The main longitudinal ridge rib (middle vertical lines) and transverse ridge ribs (alternate horizontal lines) intersect each other at the central bosses (large circles).

Liernes (shaded black) span between the other ribs, forming intricate patterning.

Note: in French terminology relating to architecture, a lierne is a ridge rib, and hence has a different meaning.