Like Bill said, it's just on camera flash. The Chicago image is caused by water drops on the lens, as with Sohrab's images through a windshield.
One of my neighbors puts a Christmas tree at the end of her driveway every year and I've been so taken with it that for years I've tried to photograph it, with little success. One day she walked out to talk to me and she pulled out a crude snapshot of the tree in a snow storm, with flash popped, illuminated snow flakes and glowing colored bulbs.
I said "That's it!" and never took another photo of her tree.