Orbs Form a Right Angle

Photo date: April 10, 2015. Photographer: Mark Mahin.

The photo was taken in Grand Central Station in New York.

Almost every orb is in the top right corner, where the orbs form a right angle you can see below, with the far edge of the right angle being the small orb in front of the window.

What is the chance of this type of arrangement resulting from random natural particles? Virtually zero.