It's kind of boring. It makes the same ring-of-fluid shape, or just random little blobs. It's not as representative of the sounds being played as it is just forming around magnetic lines of flux that don't really display the sound. The device construction is what is pretty neat here, but the ferrofluid display is a bit lacking in coolness unless you've never seen ferrofluids reacting to electromagnets before (and maybe I'm jaded because I've seen it plenty of times, and it's practically always the same effect).