Seen this stuff before, of course, but here you (1) change the shape through a mysterious touch interface and (2) can actually touch the goo.
I’d like to pull the interface farther away from the ferrofluid. A minimum six feet away. As you approach it the dynamic effects would settle down–when you get close enough to touch it, there’s nothing to see. The active zone for making it dance could be shaped around the room, causing people to arrange themselves in a prescribed queue. Or better, put some sensors on the walls and ceiling. Watch people fondle the room looking for some kind of response.