It might be necessary to work backward
from tool marks and defects in the material
on which the sky is painted, inspect the hinges
joining the sky’s three panels, yet it might
also be necessary to work forward,
protecting what doesn’t exist from decay,
light effect by light effect. The placard says
perspective is reinvented in this picture,
those angels represent a revolution in
the depiction of angels, but the halos
don’t occupy real space, all they…