Before streaming services like Spotify came on the scene, many of us listened to our MP3s using Winamp, which featured a mind-blowing music visualizer that generated colorful animations to accompany our tracks. Now artist Dakd Jung has found a way to bring back those heady days with an innovative Bluetooth speaker, containing a ferrofluid that seems to dance to your music. You can see the speaker in action in the video below: The ferrofluid is housed in a round glass container on the front of the wireless speaker, suspended in a clear liquid. An electromagnet behind this container means that once the music starts, the ferrofluid begins to vibrate, dance, and bounce around the container. Remember the 1997 movie Flubber? It looks a bit like that. You can even control the movement of the ferrofluid, thanks to a dial on the case front. This allows you to adjust the specific audio frequencies that the ferrofluid responds to, so if you're listening to a very quiet track, you can bounce the ferrofluid off the beat. The speaker itself contains three up-firing drivers, an amplifier, and a Bluetooth module so you can easily connect it to your phone, laptop, or tablet wirelessly, though all of this technology is hidden in a printed casing. 3D, giving it a decidedly space-age look.