Many of them look like sculptures.
"In a strange way, they are like pieces of art," Katsimatides said. But Daniels added that they weren't chosen for their beauty, but to explain what happened at the site on 9/11.
A few design elements of the museum are still under discussion.
When visitors descend to the very bottom of the museum â¿¿ where, in some places, they will be able to view the very bedrock that the towers once rested upon â¿¿ they will enter a hall with a large wall bearing an inscription from Virgil. "No day shall erase you from the memory of time."
Behind that wall will sit a special mausoleum, off limits to the general public, containing the unidentified remains of hundreds of 9/11 victims. Most of the interior walls of the museum have the look of bare concrete, as a constant reminder of the site's location within the old trade center foundation. But Daniels said the museum's designers are talking about possibly cladding this wall in a different material, or a different color, to separate it from the rest.
"It's a special place. Do we need something to distinguish it?" he said.
The bulk of the work remaining to be completed will revolve around installing the museum's exhibits, which will include many artifacts, including a wall made up of portraits of all 2,983 victims and a room where visitors will be able to call up video presentations that tell a story about each of them.
"The idea is to learn about the lives that they lived, not just the deaths that they died," Daniels said.