The “Mill Altar” (1410/20) was created as one of the first of its kind. The middle section shows a very picturesque depiction of the transformation of the word to the flesh, or the Eucharist. The four evangelists pour the word of God into the mill funnel, the mill in cross form represents Jesus Christ and shows the place of transformation, the 12 apostles power the mill and the four church fathers catch the trans-substantiated nourishment in a chalice and pass it on to the believers. On the side section, scenes from the life of St. Martin are portrayed.