Focus on Madonna and Child (Duccio, Metropolitan) and explain the Controversy.
There is debate between scholars of what the most accurate chronology of Duccio's Madonna and Child is.  There is more than 20 years of time where scholars do not have accounted works by Duccio leaving a questionable, although fairly certain estimation of the Madonna and Child to be made around 1300.  Due to the fact that some qualities of the painting are Bysantinesque like the oval shape of the Virgin's face and her elegantly long nose, and also of the “miniature man” nature of Christ Child, the lack of consensus of when it was created proceeds.  But, there are of course many innovative elements to the painting which align it appropriately in the time that is now acknowledged to be most accurate.  Along with the humanistic qualities between the Virgin and Christ Child, and the elegant draping, the marble parapet is a notable detail to the intentions of the painting, and serves as a visual invitation that encourages the viewer to engage more emotionally to the image.  This idea would continue on in a myriad of paintings proceeding this work.
Madonna Virgin parapet Duccio Christ Child Madonna and Child