To prepare the wall Michelangelo had all previous decoration destroyed.  In the process he changed the wall's slant from backward leaning to forward leaning at the top in order to enhance his vision of the drama.  Christ is a classicizing hero of superhuman strength.  The drama's conclusion emphasizes the slanting wall.  The damned in the two lower zones at the right will disappear into the underworld through the entrance at the far right.  On the other hand, those saved by Christ evolve from background to foreground becoming larger and more anatomically articulate.  In other words, in much the same way that Michelangelo designed the dome of St. Peter's to culminate in the dense, compact, and fully articulated lantern suspended at top, here the saved souls are becoming solid, massive, and vigorous forms suspended in heaven.