Once upon a time, NYC's World Trade Center complex was a hub of commerce, a cultural landmark, its tallest-towers-in-the-world adorning magazine covers and postcards, symbolizing accomplishment. Today it is a wound in the nation's psyche. What actually happened on September 11, 2001...and how does it tie into America's past, and the world's future? A Green Flame Omnimedia Slim: Life's Defining Moments in Slender Volumes. We exist at a time when each choice matters.