There are already plenty of ferrofluid toys that you can interact with using a handheld magnet. This Dancing Magnetic Fluid Bluetooth Speaker takes it to the next step. It visualizes your music with magnetic fluid movement. It has adjustable backlighting and sensitivity.
This speaker has a compact design, so you can easily store it on your desk. In the back, you can find 3 buttons for controlling its various features. It has a Type-C power interface.[HT]