We used a flashlight and slowly moved it in a large circle as we moved backwards.
focal length: 22.0 mm, Exposure: 16 sec,
ISO 100
For this one we used a string of smaller golden lights and spun them around in a constant circle for 3 seconds, then we turned them off and turned on a flashlight in the middle. We kept the flashlight on until the 15 seconds were up.
focal length: 24.0 mm,
exposure: 16 seconds,
ISO 100
For this set we spun the string lights ina constant circle again, and then turned them off. Once they were turned off the model moved closer to the camera and stood still for the rest of the time.
Focal length: 24 mm,
Exposure: 16 sec,
ISO 100