I'm not 100% sure what this is but I am fairly confident that it has something to do with the fire sprinkler system in the school that is seen in the background. If not, it definitely has something to do with water...and it's currently OPEN. This is just outside my daughter's school where I pick her up. I've noticed it several times when I was there and finally decided to take a photo. This particular school building used to be the high school here in Putnam County but was converted to one of the middle schools after the new high school was built. Therefore, it is at least 40 or 50 years old and very rusty!! Makes for great HDR photography.
Three bracketed photos were taken and combined with Photomatix to create this HDR image. Additional adjustments were made in Photoshop.