Page last updated at 10:37 GMT, Thursday, 23 July 2009 11:37 UK

Orchestra makes music from thin air

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This week quantum physicists, philosophers, arctic explorers, rappers and comedians have gathered in Oxford for the TED Global ideas conference with the theme of "The Substance of Things not Seen".

While most will be trying to put their ideas into words the Radio Science Orchestra will tackle the theme using "space controlled musical instruments".

The group took time out of a rehearsal to show some of their instruments that make music from light and thin air.

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