Simplicity 9/11

Simplicity is the state in which an object in a picture is obviously the main subject and focus of the photographer.

Simplicity in 9/11:

What do you see in this picture?  I see smoke (coming from the building), I see a pole (at the top of the building), I see a hole (in the building).  The building is obviously the subject because of what's happening, simple as simplicity :)