This investigation describes and demonstrates a novel technique for the visualization of magnetic fields. Two ferrofluid Hele-Shaw cells have been constructed to facilitate the imaging of magnetic field lines. We deduce that magnetically induced photonic band gap arrays similar to electrostatic liquid crystal operation are responsible for the photographed images and seek to mathematically prove the images are of exact dipole nature.
"15 sets of sequenced red, yellow, and green LED’s around the perimeter of the lens. A tesla rated cube magnet has been placed at the bottom edge of the cell with a pole facing the camera. Notice how the color bands warp around the magnet, and sometimes combine into new colors. A circle band of white light is seen adjacent to the physical magnet"
http://arxiv.org/abs/0805.4364v1
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