The second feed is based on Three.JS technology and includes hundreds of higher definition visuals, many of which are 3D. By default the ThreeJS feed will display random visuals as you play the music. If you have a pro subscription you will be able to create custom playlists in the Playlist Settings, and also custom Frequency Reactiveness settings and limit the visualizer to play accordingly.
To preview how the ThreeJS visual feed looks like watch the video below: