The bosses in Norwich Cathedral are unique and stunning pieces of art. Most of the photos on this page come from here.
“The medieval wooden nave roof was destroyed by fire after a lightening strike in 1463, following which stone vaulting replaced wood, and gave the opportunity to follow what had earlier been done in the cloister in the 1300s when hundreds of painted narrative roof bosses were set at the joining points of the structural ribs. In total there are now over a thousand painted bosses in the church and cloister, the majority of which are either components of a meta story (like the story of the world or the life of Jesus) or individual events. ” (see website)