Isn't it wonderful, then, that the grotesques are all over the place, in the churches...

Do you know the answer to this question:

Were the humorous "Grotesques" designed by some master artist, in the design and building of the church? Or were they the impromptu inventions of individual artists/artisans who did the actual building (a bit like a doodled "Kilroy was here!" but in stone) stuck in an odd corner or two?