Propeller Effect

Speaking of effects, I came across this picture on Flickr...

Slideshow Bob, who took the picture, says:

Taken with phone. Got this bizarre effect when I tried to take a picture out of a plane window.

Honestly no post processing! We were flying over a beautiful landscape, I didn't have my camera with me so I held my phone up to the window and saw this on the screen. Can't remember how many blades the propellor had, either 3 or 4, but they were long and straight.