In a mind-bending image worthy of M.C. Escher, a kneeling figure on the bottom right jamb grasps the two solid grooves and pulls them around his neck like a scarf. Detail of the "Schottenportal," the north portal of the Schottenkirche Sankt Jakob, Regensburg. The monastic church was founded by Irish missionaries and dates mostly from the second half of the 12th century. The portal has been dated to c.1180.