This is from a light painting session I did back in 2011 in a playground nearby that features a particularly cool climbing tower with a stainless steel helix.
The light sources are two cheap LED tubes of about 15cm each, attached to each other with a string, just like a num-chuk. I placed the camera with fisheye lens at the bottom of the helix pointing up. All I did was letting the num-chuck fall toward the camera to create the spiral you see.
On the first few attempts there was still too much friction with the string so I changed it to a nylon string instead which was easily doable because my house was just arround the corner. On the last one you can see what happened when there was too much friction.
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