An architectural drawing of a tower

This extraordinary architectural drawing for a monumental tower is the only known medieval design for a building to have survived from Southern France. It can be added to a small handful of architectural drawings that survive from late-medieval France, including a drawing of a church porch from Normandy (now at the Cloisters), the façade drawing by Pierre Montoloys from Clermont-Ferrand Cathedral, and the Rouen Crossing Tower (now at the Museum of Fine Art, Houston.