I have been making the laser vortex for several years as a Halloween affect on my front porch, everyone loves the affect. Finally, this year I created a Halloween site showing others how to make one of these. The video of this can be found on http://haunted.hyperreactor.net
. Its made with a laser pointer, small motor, and a mirror creating an effect similar to what you might see at Halloween Horror Nights but on a smaller scale and much cheaper.
I have uploaded the how to videos and added them the the end of this instructable along with some example videos of the vortex in action. I have said this a hundred times but once again, it is even more spectacular to see it in person. There is so much depth that the video dose not bring out.