This in one of 10 trees in the Olympic park, east London,that is part of an Art in the Park project. The were planted in time for the Olympic Games in 2012.
Each tree has a large ring – 6m in diameter and weighing up to 500kg. Each ring is engraved on the interior face with text capturing the history of the ten locations.
Oh brilliant, thanks for this - I've often wondered what these rings are about. Don't specifically remember them at the time of the Olympics - though I was aware of lots of art being commissioned.