It's Friday night, and I
didn't have a date lined up to go see Wall-E. have a big order for my 3D Printing business that I'm filling, and decided to stay in the shop for some clean-up.
I found a bottle of Ferrofluid and an old 8Gb hard drive...
Vial of ferrofluid in denatured ethyl alcohol sits on top of a hard drive magnet. A 58mm reversing EOS mount adapter (for a poor man's macro) acts as a spacer. Note the field lines shaping the ferrofluid along the 2 poles of the voice-coil magnet.