The force-field streamlines lines plug-in that I disinterred from my vfx wannabe days inspired me to reprocess the fluid sim video with the velocity streamlines drawn in. I really like the result, and it suggests to me a host of variants. For instance, I would like to trace them very densely, or perhaps visualize the velocity magnitude as a heightfield with lighting effects.
I was surprised at the way the streamline lines squiggle furiously sometimes. And while it's evident that they are responding to my movements, they also seem to be weirdly autonomous.
I kept the number of streamline sparse in this one, since when I added more, the quicktime encoder produced absolutely dreadful results -- muddy, artifact-riddled, barely legible. The youtube version is actually only marginally less ghastly. I will post a decent quicktime later.
[Later]There are a couple quicktimes of the effect here.