Idiot box

In Robert Heinlein's 'Stranger in a Strange Land' I found 'idiot box' as a reference to television. Lovely term and certainly it fits most American television. Does anyone know if this is original to Heinlein? If it is not I'd love to know more about the origin.

One reference dates "idiot box" back to around 1955. Random House Historical Dictionary of American Slang, Volume 2, H-O, by J.E. Lighter, Random House, New York, 1997." This references Merriam-Webster's Collegiate Dictionary, 10th edition. The book was published in 1962, according to what I could find.

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