Grand Central Terminal's 'Whispering Gallery'

Within Grand Central Terminal's lower-level dining concourse, near the Oyster Bar, pairs of people can stand at diagonally opposite corners of an arched tiled entryway and hear whispered conversations clearly across the arch due to the space's acoustics. This acoustic phenomenon is a well-documented novelty frequently demonstrated to visitors and noted in guidebooks and news stories. The effect arises from the station's vaulted tiled architecture and reflective surfaces rather than any supernatural cause.