Mysterious Orbs Keep "Perching" Atop These Window Frames

In the ceiling area of Grand Central Terminal are some high windows with unusual ornamental frames. Again and again, I have photographed mysterious orbs "perching" on the top of these window frames. Below are some of these photographs, most of which I have previously photographed (the second and third are new photos from November 28, 2016). You can find most of the previous posts by typing "perching" in the top left corner of this blog.

This isn't the only spot where orbs apparently like to "perch."  They also seem to like to perch on the rows of lights in the ceiling area of Grand Central. We see below some photos I have taken of orbs aligning on these rows of lights.