One such example is the seven-foot-tall charcoal drawing by contemporary American artist Robert Longo.

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Afterwards Mr Cai and his assistants damp out the fire using long poles tipped with sponges, and then smudge the lines of ash so that the portrait looks like a huge charcoal drawing on the wall of the museum's reception hall.

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His flight outfit of high boots and jodhpurs and a lightweight jumper worn over a shirt and tie was a replica of the one in which he'd crossed the Atlantic, and he spoke without removing his leather headgear or flight goggles, which were pushed up onto his forehead exactly as Sandy had them positioned in the charcoal drawing hidden beneath his bed.

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Dine alternates among charcoal, India ink, litho crayon and other drawing tools, often on the same pieces, giving a lesson in the possibilities of tonal variation using implements that must have been high tech before the Renaissance.

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