Walls have Ears

The Louvre was so constructed in the time of Catherine de Medicis, that what was said in one room could be distinctly heard in another. It was by this contrivance that the suspicious queen became acquainted with state secrets and plots. The tubes of communication were called the auriculaires, and were constructed on the same principle as those of the confessionals. The “Ear of Dionysius” communicated to him every word uttered in the state prison. (See Speaking Heads , 9.)

Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894
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