Forgot I had these. Took them earlier in the month and just found them. I took a small LED flash light, taped a piece of construction paper over the lens that had pin hole in the center. The flash light was suspended pointed down from the ceiling on a string. Camera was on a tripod pointed up, with room lights off. Color was achieved by laying gels over the lens. There was some trial and error to get the exposure right, and to get the elliptical circles right. After that I started the swing on the light, set the camera on timed exposure to fire at a set interval and swapped out gels in between. My ADD kicked in so rather than try it all in one shot, I got 5 larger outer rings in one shot, then worked another shot with the smaller rings and merged in PS.