The Sacrament of the Last Supper

Salvador Dali (Spanish), The Sacrament of the Last Supper, 1955. Oil on canvas, 267 x 166.7 cm. National Gallery of Art, Washington, DC.

Dali's large religious scene is replete with Golden Ratio references. Not only is the canvas itself (almost) a golden rectangle (267/166.7 = 1.6016..., 166.7/267 = 0.6243...), but the looming, multi-paned window is a dodecahedron, whose "surface area and volume are simple functions of the Golden Ratio" (Livio, maths.org) (paraphrase and explain). 

The geometric solid's symbolic purpose is two-fold. First, it carries cosmological connotations dating back to ancient Greece. According to Plato, the dodecahedron represents that "which god used for embroidering the constellations on the whole heaven" (Livio 68). Second, its number of sides is religiously significant. As Dali explained, "I wanted to materialize the maximum of luminous and Pythagorean instantaneousness based on the celestial communion of the number twelve:  twelve hours of the day—twelve months of the year—the twelve pentagons of the dodecahedron—twelve signs of the zodiac around the sun—the twelve apostles around Christ" (NGA). 

How do this painting's manifestations of the Golden Ratio, in the canvas's proportions and in the dodecahedron, MATCH Dali's interpretation of the Last Supper? ________ mystery of ratio, mystery of transubstantiation

It is not imprudent to agree with Guardian journalist Karen McVeigh, who proclaimed in a 2009 article, "Dali explicitly used [the Golden Ratio] in the Last Supper."