A photographer takes a picture of steel column from the North Tower of the World Trade Center during a media tour of the National September 11 Memorial and Museum, Friday, Sept. 6, 2013 in New York. Zoomed-in version of the steel at right.
A piece of a steel column salvaged from the wreckage of the World Trade Center after 9/11 is stirring speculation over whether a face can be seen on the twisted structure.
The column is being prepared for exhibit in the underground National Sept. 11 Memorial & Museum as one of two pieces of so-called "impact steel." Those are two fragments of the north tower facade that experts believe come from the exact point where the plane struck the building between the 93rd and the 99th floors.
Workers at the museum have discussed the supposed face in the steel, and some see it and some do not, according to a source at the museum. Lighting and angle apparently play a role in whether the face is visible.
The Sun publication in the UK ran a photo of the steel over the weekend with the headline, "Vision spotted in 9/11 memorial," calling it an "image that will haunt the world."
But the source at the museum said the apparent face has been discussed for some time among workers, with some even referring to it as "the Angel of 9/11."
A spokesman for the museum said: "People often find meaning in tragedy. For us, this piece of steel is historically important to include in the museum as it helps to tell the story of 9/11."
The National Sept. 11 Memorial & Museum is set to open in 2014.
--With reports by NBC News