What is one element of art in da vinci’s the last supper? how does da vinci use this element of art? what effect does it have for the painting? what is the most important element or principle of art? why?

One element was Jesus in the middle , he used the element that show that this would be the last thing holy for a long time . The effect it has for the painting is , you see Jesus calm but you see other angry or just upset showing the contrast .