Can you guess what is this?
The streaks around the tower are Rosy Starling birds. All the Rosy starlings in the city gather during winter to make formations. This behavior is called a murmuration. These birds make many formations for about 30 minutes every day for two weeks. After the thirty minutes are over, they dramatically disperse. I included the tower in the image to show that all this was happening in the midst of a very busy city, Ahmedabad. The reason I had been to Ahmedabad was for CNP meet in 2023 (The link to my gallery). I decreased the Shutter speed to 1/13s to achieve this effect.
Nikon D750 + Nikkor 24-120mm lens