The first time I walked in El Barrio, B'ham's hottest new Mexican restaurant ( pun intended), I took one look at the light fixtures and said, "I've seen those thingys somewhere before!" Turns out that they are
"gravity exhaust vents", according to my "experts". If not for their expertise, I'd still be calling them "one of those things that spin around on roofs". I like them even better as cool light fixtures! Regardless, this is one very busy spot downtown and you might want to have lunch or dinner there soon. I plan too!
2211 2nd Avenue North