When I was at AstroFest 2010 in London, the University of Central Lancashire had a booth set up.
There was a computer monitor showing an animated clip of galaxy interactions in 3D! You have to put on circularly polarized glasses to see it. I was so delighted, there were streams of stars going behind other galaxies, and coming out from the screen. There was no guessing about which direction the attacking galaxy was coming from. Shredded bits of galaxy were zooming away in every 3D direction.
Victor P. Debattista told me that it took a week of high powered computer time to generate the animation, which lasted about a minute. I forgot to ask if it was based on a real cluster.
Here is his website, but it is just not the same. The animation was so pretty! and useful and educational. You had to be there.http://www.star.uclan.ac.uk/~vpd/index.html