Sony Tokyo's R&D group recently showed Music synchronized artistic expressions for Ferrofluid. The artwork, by Yasushi Miyajima and Sachiko Kodama, consisted of a dome filled with ferromagnetic nano particles suspended in a treacly black oil. Using a combination of voltage-regulated electromagnets and metadata added to music beforehand, the nanites appeared to react to the music, assemble themselves in line and form a stunning tree-like display on a central metal pillar.