"The paint has a skin to it, here taut and glossy, there wrinkled, abraded, scarred. It is pierced, abraded, scraped. A line drawn through it will go through half a dozen states, from the furry bloom of crusted charcoal to a blind furrow, cutting a channel in to soft paint below."

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Before he did all those lovely line drawings, Matisse would make really detailed charcoal drawings and tear them up. He wouldn't leave them about... I understand what he was doing: discovering what's there... to make the line meaningful, to find a linear solution.

— David Hockney