I live in Leeds where there is lots of redevelopment going on in the city 
centre.  I was driving through the other day and got wondering "How do they 
build them and get the crane cab and boom up there?"  Do they use another 
crane?  If so how did they build that one, did they use another crane?  If 
so....... Do we have a chicken and egg situation here?  I have never seen 
one of these things erected, they just seem to appear overnight.  Is it the 
crane fairies job to put them there?

Cheers

John