I had a feeling they might do some time offset stuff last night so I made some paranoia links with different time combinations. Over in the IRC we just figured out it's spinning. Lots of code to rewrite. (also added some new links above to illustrate)
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Yes, I thought it was a spin. The center part looked like a line and that line kept moving for me. Might I suggest making a gif of all of the activity instead of stacking them. (i.e. instead of making a gif of the geomask - make a gif of the activity on the output. You should be able to do that with a minimal code change and it would give people a starting look at the data.