As you can see, the 'square' is really an ellipse,

which reminds us of Scott Circle in DC.

Scott Circle differs from the ellipse in Rome in that it is rotated 90 degrees to that, and it is constructed around a hexagram, rather than the eight pointed figured at the Vatican. They do share the same ellipsicity; that is if you make the images 75% narrower you will get a circle again.

In the images above, the alignment has west at the top in the first one, but north is to the top in the second (Sc Cr). The DC version illustrates the ad triangulum form while the Vatican version illustrates ad quadratum. There are 16 sections in the dome and 16 pairs of columns.

While the dome reminds us of the Capitol, the elements over the windows are the same alternating arch and gable that we see at the White House located at 16th Street.

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