At the base of the two northern pilasters, look closely at Lorenzo Maitani's marvelous carved marble bas-reliefs of scenes from the Old Testament and the Last Judgment.
The two northern pilasters are the only two to harbour impressive artwork.
mnli hypothesis: The two northern pilasters are the only two to harbour impressive artwork. premise: At the base of the two northern pilasters, look closely at Lorenzo Maitani's marvelous carved marble bas-reliefs of scenes from the Old Testament and the Last Judgment.