The world-renowned showpiece of the National Museum of Catalonia in Barcelona is a 900-year-old fresco of Jesus that once adorned the apse of the Romanesque church of Sant Climent in Taüll, located in what is still a difficult-to-reach Pyrenean valley. Jesus is shown as an energetic ruler of the world. Despite the stylization, the slender face appears lively, the eyes are wide awake, and the hair and beard are fashionably styled. It is the timeless image of a doer, a...