Zach Lieberman is making sounds. “Click.” “Psh.” “Ah.” “Oorh.” “Eee.” With every noise, an amorphous white blob bursts onto a screen, leaving a trail of shapes lingering in the air. As Lieberman moves his phone backward through the cloud of blobs, the noises replay in reverse as if he were rewinding a vinyl record.

Source: An Artist Uses an iPhone to Visualize Sounds in AR | WIRED