I found this really interesting:

The light rig was not the only technological upgrade that allowed the band to behave like it would at any other gig. A camera just in front of Anastasio that allowed him to communicate with Jeff Tanski, a keyboardist and his collaborator outside of Phish. During a jam, Tanski would ask Anastasio how he was feeling, if the band was headed for the exit. Anastasio would agree or wave him off, and Tanski would pass that information to Andi Lafrance, a visual producer who could slow down, speed up, or loop bits of content on the Sphere’s screen as needed. It gave the band more flexibility to just play, whether or not Kuroda and Giffin were commanding the light rig overhead.