Ferrofluid Fun: Links
Minako Takeno University of Wisconsin 
- Ferrofluids – movie of demonstration
Left: "Protrude, Flow," showing ferrofluid with poles above and below (© Sachiko Kodama & Minako Takeno; Photo by Yozo Takada)
Right: Ferrofluid spikes above pole of ring ceramic magnet (photo courtesy of ForceField)