GR translation: pitched out over the sea of ruins

[Mike Jing]

V373.7-11, P379.6-10    Smooth facets of buildings have given way to cobbly
insides of concrete blasted apart, all the endless-pebbled rococo just
behind the shuttering. Inside is outside. Ceiling-less rooms open to the
sky, wall-less rooms pitched out over the sea of ruins in prows, in
crow’s-nests. . . .

What does "pitched" mean here?