Using a tower crane to install the southeast corner panel. That's three corners up so far.
Photo By GreenwichBoy over at WNY.
I think it well take a bit of time to get the first row up, they have to get it just right or the rest won't fit. Once they get to the 21st to 22nd floor installation should speed up.
Let's see, no leave outs on the south side, maybe 4 panels each left out on the east and west sides for the constrution elevators. That leaves the northwest corner, I expect they well take down some crane track soon so there well be no leave outs for it.