light emitting diode
So this is from my first attempt where you hang a light of some sort from a string, cord, etc and set it to swinging with the camera set up to catch the light trails on a long exposure. The led light is from the insert from a toy one of the kids got that lit up when you threw it around. The casing for the light device split open and I saved the lights for a shot like this. I hung it from the pull cord on our ceiling fan and got this.
Submitted to Photo Friday - 'Circular'