Hi There. The wonders of the internet that I can see where views are coming from. And it is nice to see some healthy debate about how the Ball of Light comes to be.
Interesting to read the comment that creating the Ball of Light without a mechanical device would be "impossible".
As I am the tormented person who spends many cold and lonely night out there creating them I assure you that the Ball of Light is created in a single exposure (in raw as well that is viewed by anyone purchasing a print) and uses no mechanical devices whatsoever. Not one pixel is added or removed from the image in PP.
The Ball of Light is the culmination of hundreds of hours (and hundreds errors) of practice and some pretty trick electronics. I would suggest that before being so bold as to suggest something is impossible anyone that doubts go and have a look over the Ball of Light set and enjoy.
I hope you enjoy the work. And the only reason I have posted here is that in asking your initial question you are obviously keen to learn. The responses you have recieved thus far suggest that you cannot achieve the results you see of my work. I assure you that with very little equipment and a remote for your camera you can quite easily achieve what you see.
Have fun,
www.balloflight.com.au