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On the sign:
Information is light. Information, in itself, about anything, is light.
The Library Walk, is a venture launched in 1996 by the New York Public Library, Grand Central Partnership and New Yorker Magazine, in which are embedded in bronze plaques quotes from well-known books, or those dealing with books and literature. The panels designed by artist Gregg LeFevre were laid in 1998 from the New York Public Library building along 41st Street.
The quote is from a play written by British playwright and screenwriter Tom Stoppard.
The plaque shows light rays that represent what is said in the quote about the light in the information.