Three Orb "Straddlers" in Two Consecutive Photos

Photo date: August 26, 2015. Photographer: Mark Mahin.

The photo below was taken in Grand Central Station in New York.  In this photo we see two blue orbs that both are kind of "straddling" a physical line in the station, with half of the orb on the left of the line, and half of the orb on the right of the line.  The smaller "straddler" can be seen at the bottom of the photo, at the bottom of the stairs.

The very next photo showed another orb "straddler."  Again we see half of the orb on the left of a physical line, and the other half of the orb on the right of the physical line.

Are these mysterious things deliberately positioning their middles on these lines in the station?