The Scream face is interlaced within this Carl G. Mueller's 911 artwork.
Abstract artistic impression of 9-11 by Carl G. Mueller, Nam 68.
Upper left side metaphorically shows the American flag shredded by the first plane.
This first plane has already hit the first tower.
Little x marks respectfully represents victims jumping from the now collapsing tower.
Left side also shows the second plane again shredding the flag and about to hit the second tower.
The far right shows both towers collapsed but the Statue of Liberty is still standing tall.
Lower left and front of the envelope represents the New York skyline.