"What if Walker's life is a work of art in progress?" he asks.
It is the most marvelous example of a work of art in progress".
"You say, 'I've had breast surgery, and I am a work of art in progress,' " she tells me.
Like a work of art in progress, our brain is constantly being shaped and re-designed throughout our lives.
But a great golf course -- even, if not especially, Augusta National -- is as much a work in progress as a work of art.
At the 2010 World Cup, Fabio Capello's side looked to have a favourable draw but made heavy work of progressing from a group including United States, Slovenia and Algeria, eventually finishing in second position.
He sat in front of a work in progress, "Meeting of the Generals," sitting on an easel.
So what we perform live is more of a work in progress most of the time, rather than something from an album we have already finished.
Originally, the set of images was presumed to be the beginning of a work in progress, but as of 2009 no additional videos are planned.
The global economy is still a work in progress, of course, but its effects have already been dramatic.
