Magnetic Field Stone
this artwork, fine grains of magnetite, a natural form of magnetic
ore, move in response to a powerful magnet rotating inside the stone.
The particles line up, south pole to north pole, creating jagged
spikes that swirl around the center of the bowl. Visitors can push
the sand around and watch it pull itself back together, or hold
a handful of sand at the bottom of the bowl and watch the sand dance
in their hands. The magnetite here was collected locally; in fact,
navigational charts sometimes warn mariners for false magnetic readings
from San Francisco's magnetite-peppered shores.
- Magnetic Fields and Forces
- Perception of Texture