Sea of voices by Invisible Flock is an interactive digital art piece which is based on a physical journey through Brighton. First you download either an app for your phone or mp3 and then your journey begins.
I actually didn't go on the physical journey as I chose to close my eyes, lay down and envisage this journey by listening to the mp3. I know that I missed out on aspects of the interaction from the physical journey, but I loved imagining that I was there, and since I live in Brighton and know the area really well I found this to be a fantastic meditative experience.
While I didn't do the walk, I think it would be fun to go along and do too.
The video below shows the preparation of Sea of Voices: