The work was destroyed in 2001 in the aftermath of the September 11 attacks , crushed under thousands of tons of rubble when 7 World Trade Center collapsed . About 40 percent of the sculpture was recovered from the debris in the following months . With not enough of the original remaining for a restoration , the recovered elements were stored by the Calder Foundation . Today , a portion of the sculpture can be found at the National September 11 Memorial & Museum
September 11 attacks
September 11 attacks
Bent Propeller