Legacy.

Just one of the scores of quirky buildings that grace Dublin City. 
A legacy of our time as the second City of the British Empire behind London.
I've often remarked that Dubliners never look up from street level.
Tourists do.
You could show this shot to the majority of Dubliners and they wouldn't know where it is, even though it is in O'Connell Street in the City centre.
The rooflines have many such architectural features.
Must count them some day.