“I think van Gogh was one of the great, great draftsmen. I love the little sketches in his letters, which seem like drawings of drawings. They are condensed versions of the big pictures he was painting at the time, so that Theo and the other people he was writing to could understand what he was doing. These days he’d be sending them on his iPhone. When you look at them, they contain everything. It’s all there. He certainly didn’t do anything by halves.”

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“Limitations are really good for you. They are a stimulant. If you were told to make a drawing of a tulip using five lines, or one using a hundred, you’d have to be more inventive with the five. After all, drawing in itself is always a limitation. It’s black and white, or line or not line, charcoal, pencil, pen. You might have a bit of color—but if you can use only three colors, you’ve got to make them look whatever color you want. What did Picasso say? ‘If you haven’t got any red, use blue.’ Make blue look like red.”

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