

Sometimes you don't know what your major masterpiece is going to be. Francis Bacon, for instance, started this one painting called "Painting 1946" for which he is quoted is saying:
"It came to me as an accident. I was attempting to make a bird alighting on a field. And it may have been bound up in some way with the three forms that had gone before, but suddenly the line that I had drawn suggested something totally different and out of this suggestion arose this picture. I had no intention to do this picture; I never thought of it in that way. It was like one continuous accident mounting on top of another."
Bacon's "Painting 1946" is generally regarded as his masterpiece. The guy just knew how to make a great painting, albeit in his own brilliantly twisted dark vision. He made it work, making it up as he went. That takes more than technical skill, that takes an accomplished sense of vision, the ability to improvise, and a great eye. The creative spark.
The creative spark is that energy that a creative artist has. It's the enegry that is restless, pushing the artist to shoot for something new and different, even if it's only new to the artist. Something challenging, maybe risky. Something of personal vision. The pursuit of a vision is found in the great moviemakers, who will taylor their amazing technical facility to make each scene work to the service of good storytelling.
Again, The creative spark is like a jazz musician who will sacrifice ego to create a performance that doesn't showboat individual ability, but makes the song work. Vision is the key. The big picture, where thought and idea are all, and technical abililty is only is a means to an end.
Artists with the creative spark are not technically minded, though they have technical ability in spades. They'll do whatever it takes to make the painting work. Sometimes that means plenty of time and effort while drawing on that technical facility, and sometimes that means throwing that technical facility to the wind. The important thing is that the painting "works".
That creative spark commands attention. It keeps people off guard, not knowing what to expect. There's a sense of excitement. The creative spark can take one to a place where technical skill is challenged. The improvization of a jazz musician like Miles Davis, for instance, may not always be a flawless performance, but it can reach brilliant hieghts unavailable to the trappings of technical proficiency alone, but wide open to the artist who knows who they are. An artist who can draw from personal vision and communicate that more essential humanism.
Robert Motherwell, that enigmatic and genius abstract painter, once said that even after a lifetime of painting, he could still do a bad painting. I love that. That's my kind of artist.