The larger the scale of an event, the more symmetrical it looks from a distance. Imagine, for instance, you are out in space, observing a mile-wide asteroid hitting the Earth. You would see a flash of light, then a rapidly growing, perfectly symmetrical dome of energized material raising from the surface (in perfect silence, of course). After the site cooled, you would probably see a very neat, circular crater where the asteroid landed.
Now imagine what it would look like if observed from the surface. You would be in the middle of hell.
Take what you've learned here and apply it to the collapse of WTC7. It looks pretty smooth from a distance. How would it look if you were standing in the street beneath it?
Like this
http://911research.wtc7.net/wtc/evidence/photos/docs/fsn/b7pile2.jpg
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