Mysterious Orbs Surround the Unisphere

Photo date: July 16, 2015. Photographer: Mark Mahin.

Below we see the famous gigantic steel sculpture called the Unisphere. Built for the 1964 World's Fair, this giant globe still stands in Flushing Meadows Corona Park in New York City.  We see this giant steel globe surrounded by several mysterious orbs.

Here is another photo from the same day showing more orbs:

Here is another photo from the same day showing more orbs, including a bluish orb:

 Here is another photo from the same day showing more orbs, including a peach-colored orb with an orange aura.

What were these orbs doing -- studying their geography, perhaps?

There was no fog, mist, rain, or precipitation on this night.  The air quality as listed on airnow.gov was good, with a rating of 38. The pollen count listed on pollen.com was low-to-medium, with a rating of 4.4.