"There was a $30m mock-up made of a whole section of the facade, with five versions of the fin in different shades of white.
The bandcourse of quatrefoil originally extended across the center section of the facade.
During restoration work carried out by archaeologists the back wall and a section of the facade were left exposed.
The decorations to the upper parts of the central section of the facade survived until at least 1974, as did the tracery to the square windows on the towers; this Gothic ornamentation was removed after it deteriorated.
The inspector said a section of the brick facade at about the 10th floor, on the southeast corner, was cracked and leaning away from the building.
Two other photographs, "Flesh Cloud" No. 1 and No. 2, depict a section of the brick facade and cobblestoned roadway of a medieval church in Stockholm's center.
The surviving section of the north facade remained standing for months, precariously leaning on the ruins of the United States Custom House, and required much study before it could be taken down.
This is where a 100-foot-tall by 100-foot-wide section of the lower facade of the north tower -- the infamous Gothic arches -- is kept, disassembled into 25 pieces weighing 80,000 pounds apiece.
By scaling the building in such a way, they can access large sections of a facade that have never been touched by another pixador.
This put the adaptive behavior of the facade rules (Section 3.4) to the test, as an enormous variety of facade topology had to be handled.
