Ferrofluid is a lot of fun to play around with. You can interact with it using a handheld magnet. Some have even used it to make fancy speakers. Take Jeran Design’s Ferrofluid Bluetooth Speaker: it uses electrical signals generated from your music to put on a show as you listen to songs. It has a 3D printed shell and 3000mAh battery.
This ferrofluid speaker has a range of 33ft. It has a knob that lets you adjust the rhythm to match your music. You can find this on Etsy.
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