Light Verse for a Heavy Universe

So clouds hung heavy a century more,
’til Pittsburghers cleared the smoke away
and found that the air, when clean, is gray.
Councils were called. The coal burned late.
Then, lo! Tall buildings began to rise
and banners unfurled to advertise
“The Renaissance City” (no, it’s true!).
“The Golden Triangle” lines the sky,
whose color, in Pittsburgh terms, is “blue.”
These transplants took with such success
that only a quirk or two still lie
in the city map, whose streets confess