It looks like interweaving smoke. will be interesting if it is a probability cloud, overlying on an image, to give a different texture of familiar image, but totally different texture.
Probably unrelated but your discussion reminded me of an interesting theory of why people act differently in crowds. It was developed by Elias Canetti in the mid-eighties: http://www.amazon.com/exec/obidos/ASIN/0374518203/wnycorg-20 “There is nothing that man fears more than the touch of the unknown…It is only in the crowd that man can become free of this fear of being touched. That is the only situation in which the fear changes into the opposite. The crowd he needs in the dense crowd, in which his body is pressed to body; a crowd, too, whose physical constitution is also dense, or compact so that he no longer notices who is is that presses against him.” Maybe your simulation could account for these sorts of crowd behaviors?
Really like this! It might help the aesthetic a little bit if you faded out older circles…after a while portions of the canvas turn a solid color with little definition, and I thought the most interesting point in the video was when the canvas was covered, but not so dense that the image lost dimension
See A-Paint by John Maeda (1994); MicroImage by Casey Reas (2002?), based on Braitenberg Vehicles. By having built the flocking from scratch, you develop a good understanding of how it works.