Animated Swirl

The last few days it has been to hot to work to work on my workstation. Our only AC is in the living room, and that's where I sat with my Macbook. Inbetween other stuff I have been playing with Blender again. I had temporarily abandoned the Python scripting experiment that led to this plane render. I could not get it to animate. But I finally figured it out:

Still using a bit of a roundabout way, but inching closer to making it work for me.