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How does this Bluetooth speaker visualize music?

Answer: With magnetic ferrofluid.

Closeup of sliders used to control music.
Shutterstock/Number1411
Artist Dakd Jung has found a new and very entertaining use for ferrofluid, that black liquid-like substance that reacts to magnetic fields and is usually featured in things like desk toys. Jung has used the stuff to create a real-life version of Winamp’s popular visualizers that created fun animations that synced with whatever music you were listening to.

The ferrofluid is suspended in a clear liquid within a glass container on the front of the speaker. It’s stationary when the speaker is silent, but as soon as the music turns on, the ferrofluid will come to life and move around in time with the music. This is thanks to an electromagnet at the back of the container, which is controlled by an Arduino Nano. There is also a dial that allows the user to adjust the audio frequency that the ferrofluid will respond to, such as if a song has more treble or bass.

The housing for the device was made with a 3D printer, and Jung sanded and painted it to give it a high-end finish. Inside it are three upward-firing speaker drivers, a compact amplifier and a Bluetooth module.