Glimpsed in the Naudet Brothers' documentary about the events of September 11th, these human forms apparently in frames the dimensions of WTC windows. They are seen on the bridge between the Marriot and the North Tower. So what the hell are these things?!
Also, check out this very intriguing theory about those "artists" who managed to surreptitiously build a "balcony" on the 73rd floor of World Trade One, and how their story just might give some serious insight into exactly how much tom-fuckery it was possible to get up to behind security's back in those tremendous structures, putting lie to the idea that it would have been "totally impossible" to set them up for total destruction, post-impact, as the Popular Mechanics worldview seems to dictate.