Interesting - that's quite a cool effect.
I recently tested a lens that the rental hosue called the 'mesmeriser' which is very different - it's a modified 300mm Canon EF lens which has been PL mounted, and then there's a wheel on the side of it that you can turn and the image sort of... spins, I guess... It's really difficult to explain but it's a cool effect. Very early 90's sitcom.