It hasn't been just new projects that are making headlines: In November, even the Empire State Building got a makeover, when the owners installed a new LED light system whose millions of colors can ripple, cross-fade, strobe and burst in time to the tunes of Alicia Keys or a special New Year's show.

WSJ: On the Rise With High Rises

Theoretically, Filler said, if some fraction of the LED were projected backwards into the system, embedded solar cells could capture some of that light as well.

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