Plica umbra - <p><i><a href="//commons.wikimedia.org/w/index.php?title=Plica_umbra&action=edit&redlink=1" class="new" title="Plica umbra (page does not exist)">Plica umbra</a></i> </p> © Andreas Schlüter - CC BY-SA 2.5 - Wikimedia Commons
La Trinité