The church's most beautiful and symbolic capital is called the "Mystic Mill".
A man dressed in a short garment pours grain into a mill while another man with a high forehead, bare-footed and dressed in a flowing garment, gathers the flour. The first one represents Moses. The grain is the Old Testament Law received on Mt. Sinai. The mill is Christ, symbolized by a cross, who grinds the grain, and the Apostle Paul gathers the flour, representing the teachings of the New Testament.
The law of Moses contained the truth, but it was difficult to understand, hidden like the flour in the grain. By the sacrifice of Christ on the cross it was transformed into the Law of the New Testament which it was St. Paul's mission to gather and distribute. The depth of the theological material and the artistic quality of this capital suggest that it may well have been the work of the artist who did the tympanum and this has been suggested to be Giselbertus who carved the tympanum at the Cathedral of Autun.
This capital goes with the theme of the Pentecost on the tympanum.