re.flow is not closely related to the primary mission of Flow, but it is an example of some prior work of its founder, Jason Marsh. It is a visual and aural re-mixer built to show off the spatial audio possible with Dolby Digital Plus.
It uses multi-channel audio synchronized to 3D abstract forms moving through space around you. You can control each of 16 clips spread across 8 tracks to build your own unique mix, ranging from the ethereal to high energy dance. Each 3D object is tied to one track.
Try it now: dolby.flow.gl.
This experience is best using Microsoft Edge on Windows 10, or Safari on MacOS. These browsers have the ability to decode Dolby Digital Plus, which is the only way to experience the spatial audio.
How was this done? Go to the articles that describe it.