A Thousand Thoughts inspires Sundance Film Festival

One of the best received works at the 2018 Sundance Film Festival has been a "live" documentary called A Thousand Thoughts.

A co-director provided the narration. Video was projected behind him while a celebrated string quartet performed.

The aim of the piece is - among other things - to tell the history of the Kronos Quartet.

BBC Talking Movies' Tom Brook reports.