In “Black,” filmmaker Susi Sie combines her visuals of shifting ferrofluids with the music and soundscape of Clemens Haas to create an ominous, almost claustrophobic vibe. With fast cuts and shallow focus, the sharpened points of the normal-field instability appear as flashes of brightness in the dark. At times, the liquid’s surface looks almost like a speaker cone, which is appropriate since ferrofluids are frequently used in speakers to provide cooling and enhance performance. (Video and image credit: Susi Sie)