It was a really nice day, and I went up to Hummock Hill to take a picture of the foreshore beach area to send to a friend. I took a panoramic shot from left to right. When I got back to my computer, and uploaded the photo, I realised there was something in the middle of the shot. I hadn't noticed it at the time of taking the photo. Upon closer inspection I could see what appeared to be a vapor-cone (thanks google)at what I assumed to be the back. Can't say why I thought it was the back, as I didn't see anything with my eyes. But from the picture it appears to be moving from left to right.