Sitting by the lawn of Bryant Park, facing South, when I took a photo of the Empire State Building jutting out among the buildings on 40th St. I didn't notice the object when I was aiming my cell phone camera and didn't notice it after. I didn't see it at all until I looked at the photo. It wasn't a advertisement banner dragged by an aircraft because it wasn't there when I looked up the sky to take the photo. And I don't think NYC allows banner-dragging aircraft over Manhattan.