Memories of September 11, 2001, remain vivid twenty-five years later. A clear blue sky is a recurring detail in recollections of that day. Blue ribbons were tied around cars and a blue train was scheduled to run beneath the World Trade Center.

A professor recalls the sky being particularly blue that morning. He had arrived at work and was informed about the events unfolding on television.

Further details about personal experiences and reflections on the events of September 11, 2001, are available from the original account.