"It's true, I do sometimes suspend myself over the canvas, but mostly I work at a table when I'm making a painting. When I use 'The Rig,' my feet are firmly anchored. I lower myself horizontally just long enough to make a brush stroke - a matter of seconds - and then I'm upright again. My assistant then erases the painting quickly with a squeegee and I go for it again... until I get it right. It's like trying to hit a home run."

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It is preferable to regard labour, including, of course, the personal services of the entrepreneur, and his assistants, as the sole factor of production, operating in a given environment of technique, natural resources, capital equipment and effective demand. This is why we have been able to take labour as the sole physical unit which we require in our economic system, apart from units of money and of time.

— John Maynard Keynes