I, too, have been counting cranes. In my travels, I have become very aware of all the cranes being used in constructing buildings & thought it interesting.
Here is an article I found that might interest you as well.
http://bizbeatblog.dallasnews.com/2013/09/counting-cranes-state-farms-richardson-project-tops-an-old-record-from-the-1980s.html/
Quoting Jason Mraz:
“… it takes a crane to build a crane | it takes two floors to make a story …”