Medieval decoration of the ceiling of the crypt

Second vault of the central nave. The east segment represents a brown crown with outward protuberance similar to thorns and central circle united to the perimetral one giving a seemingly turning movement; the north segment represents a faded figure formed by three brown lines with blue elements interpreted as a peacock; south segment represents a brown eight-pointed star-crown around a flower with eight two-edged petals; the west segment is empty.