Hurtling Orb Makes a "String of Pearls"

Photo date: February 5, 2016. Photographer: Mark Mahin.

The photo below was taken in Grand Central Terminal in New York.  We see a moving orb that creates a "string of pearls" effect that I have often photographed before (as shown in this series of 28 photos).  Each  of the four "pearls on the string" is presumably a different position state of a single object moving very fast.

The photo was cropped from the larger photo below.

On the same day I photographed a much brighter orb near one of the huge windows at this place.