[pooh]

I hope you don't mind, but I have a cyberfriend who is a cameraman for an L.A. studio and I asked if he had any idea what your camera "saw." He knows quite a bit about how and what is seen by the lens and offers this possibility: " ......the picture was taken with a .... cell phone, with a low resolution of only 478 x 799 pixels..........it was taken in failing (that is, dim) light with a long exposure, as is obvious from the image -- overexposed windows, underexposed roof on the left, underexposed wall along the water, underexposed trees in the background.

My guess is that the white trail is an insect with a rapid wing beat flying in front of the lens during the exposure. The trail is very out-of-focus, meaning that it was much closer to the lens than the fence in the foreground. The modular look of the trail is due to the beating of the wings, each module being one wing beat."