Ferromagnetic fluid, small magnet
Ferromagnetic fluid, larger magnet
Ferromagnetic fluid, small magnet, exposure to long and motion blurs picture.
Ferromagnetic fluid, small magnet, exposure to long and motion really blurs picture.
Ferromagnetic fluid, magnet #3
Ferromagnetic fluid, magnet #4
Ball point pen tip
Ball point pen, roller ball. Notice the missing ink.
