From the cathedral website:
A large onyx disc, Lunar Disc I, by Emily Young,
was installed in the Close of Salisbury Cathedral on the afternoon of Friday 25th November [2005].
The sculpture is placed on the north west lawn outside the Cathedral for an initial period of two years.

Lunar Disc is made of one billion year old, semi translucent onyx and stands about six feet high on its plinth.
The owner of the piece has generously loaned it to the Cathedral because they wish people to enjoy it -- to see it, touch it and feel it.
Writing about this work Emily Young says "the disc is synonymous in my mind with both the oneness of the universe, of our planet and all who inhabit it,
and the unutterable wonder of nature and creation. When the sun shines through it, in the early morning or in the evening,
a halo of golden light appears around the edge. It is not an image of man, but an image of the provenance of man."

Lunar Disc I was first exhibited outside St Pancras Church, Euston Road, during an exhibition, 'Recent Stone Carvings',
in 2004 and has since been displayed in the Lothbury Building in the City of London.

Emily Young is one of the foremost sculptors in Britain today.
Her distinctive work can be seen in many public and private collections around the world.

I must obviously return "in the early morning or in the evening"...!