Andrew Carnegie, eighty-three, once the mightiest industrialist in all the world, now a wizened and influenza-ravaged man who for nearly two years had been under doctors' care in his block-long, six-level mansion on Gotham's Millionaire's Row, took up the instruments brought to him and began to write as if possessed.

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Still, our index gives us a chance to look at real estate on a granular level, highlighting the block-to-block differences that really define local markets.

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Then the designers carefully add the smallest details, using street-level videotape and photographs of every city block, building and storefront.

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The level of responsiveness and accuracy required by Block 54 is not possible with any other existing motion-control technology, according to the company.

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