Often the work we have not done seems more real in our minds than
the pieces we have completed. The irony here is that the piece you
make is always one step removed from what you imagined, or what else
you can imagine, or what you’re right on the edge of being able
to imagine. Small surprise. After all, your imagination is free to
race a hundred works ahead, conceiving pieces you could and perhaps
should and maybe one day will. Vision is always ahead of execution,
knowledge of materials is your contact with reality, and uncertainty
is a virtue. A finished piece is, in effect, a test of correspondence
between imagination and execution. And perhaps surprisingly, the more
common obstacle to achieving that correspondence is not undisciplined
execution, but undisciplined imagination.
Art and Fear - David Bayles & Ted Orland