A courageous engineer took some video footage from the top of the US$4bn <b>Burj Dubai</b> . The images are shaky, but the overall experience of watching this rare clip is dizzying and marvelous. If you watch closely, you can see that some of the other engineers and construction workers have scrawled some kind of graffiti at the highest point of the tower. The tip is said to be some 812 metres off of the ground. From that height, large buildings look like toothpicks and cars are the size of ants.