Stonehenge 'inspired by flute sound'
17 February 2012 Last updated at 17:19 GMT
Music could have been an inspiration for the design of Stonehenge, according to an American researcher.
Steven Waller's idea is that ancient Britons could have based the layout of the great monument, in part, on the way they perceived sound.
He has been able to show how two flutes played in a field can produce an auditory illusion that mimics in space the position of the henge's pillars.
This is the sound made by the type of flute (Wilsford model) played by ancient Britons. It is played by Simon Wyatt.