Two medievalists – one medieval art historian, one medieval linguist – jointly blogging about cathedral vaulting and languages written on vellum, and occasionally life as alternatively employed medievalists, too.
The left-hand side of the header is a picture of the vaulting at Saint-Denis, taken by Vellum. The right-hand side is part of a photograph by flickr user Celeste, a Creative Commons Licensed picture called "El espinazo del Diablo" -- check it out.