Ferrofluid displays

I made this for a public display at the Gravity Discovery Center. The requirements I wanted were that it be interactive, non-messy, low maintenance, and very clearly show the spikes without glare from lights.
“Continue reading” for more details, photos and a video.

I built up this solid display cabinet which is free standing and should not tip without a lot of effort. The fluid is held in a replaceable tray which can be removed for cleaning. Lighting is from two shaded fluorescent lights at the side and one direct reflecting neon. Any small disturbance in the fluid alters the reflected neon light and once spikes form they pick up the light of the fluoros.
Here are some sample photos prior to installation with neon illumination only.

The installed display with two magnets dangling down and the top view. The sloping acrylic front helps prevent reflections (except for the flash used here).