Smearing a small copper plate with black ink, Francesca rubbed the excess away, carefully pushing it into the etched grooves.

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The renowned oxidised copper plate dome was created by Madame Tussauds, originally to house its London Planetarium show.

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Two years ago, William Souder reports, the Audubon Museum in Kentucky made 250 fresh, arresting prints of snipes from an original Audubon copper plate.

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Descriptively titled Part of a Large Magnificent Port Used by the Ancient Romans, the print seemed unusually cramped and illogical in perspective, Hebborn claimed, as if Piranesi had tried to fit his scene on too small a copper plate.

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The Parsons show will feature a piece that now has special meaning to her: Two years ago, one of her friends made an edition of 10 prints from a copper-plate etching she had made.

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Although the process of transferring a musical composition from a gleam in the composer's eye into a handwritten manuscript and, finally, a performance-ready score has come a long way from the days of copper-plate engraving, it's a process rife with the possibility of transmittal error.

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The third objective, efficient design, involved sandwiching the nanostructured bismuth telluride between two copper plates and then enclosing the upper plate (the one coated with the light-absorbing oxides) and the bismuth telluride in a vacuum.

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