Silent waves

I saw this effect on a web page and tried to recreate it.  It was also cold and raining so my special thanks to my two models that braved the night for my picture.  The concentric circles at first thought seems like a very difficult task.  Not really.  I had everything I needed in my workshop.  A paint roller and the long handle, a string of lights, duct tape (black tape would be better), and a light stand.  The lights are taped to the handle of the roller and the roller is jammed onto the top of the stand.  After locking open the shutter I got behind them and rotated the handle one time.  It was just that simple.  Now that the test worked I need to incorporate it into more pictures.