Ferrofluid is lots of fun to play around with. The Inspiration Ferrofluid Lava Lamp takes it to the next level. It works like a regular lava lamp, but you can also interact with it using strong magnets. You can push and pull it to form all kinds of fun patterns and spikes.
This lamp ships with a base, bottle, light bulb, 4 hematite magnets, and a neodymium disc magnet.