Smoke Billow with Floors in it:

Here is a photo shown at

http://www.geekphilosopher.com/bkg/911wtcThickSmoke.htm

It is described on its source page as a „U.S. Coast Guard Photo”.

Who was blowing smoke rings?

Could it be when the controlled demolition charges went off, floor by floor, they left their after-image standing inscribed in the columnar smoke billow as it slowly rose to heaven?

Think about it.