As I said before, the demolition of the Trade Towers was designed to look like a gravity driven progressive collapse. It was exploded from the top down rather than imploded from the bottom up.I am really puzzled; which known controlled demolitions of towers does this collapse resemble, in your opinion? I have watched half a dozen towers demolished, often at quite close quarters, including one where I used to live. None resembled any of the WTC videos at all. Nor do any of those videos of controlled demolitions I have seen online.