Ok, Third (and last) post of photos from my awesome little roof top exploration mission. The other two are HERE and HERE.
Here's something really rad that I noticed. I'd always thought the big metal circular things were just (perhaps somewhat unattractive) decorative corner articulation elements, but it turn out they have a pretty interesting functional use...
...lightning conductors. That steel cable goes all the way round the roof of the building before running down to earth.
Well I thought that was pretty clever. Anyway..