Microsoft's Surface: A deeper look 
Published: 03 Oct 2007 16:05 BST
This application shows an image of the bed of a stream. When you place a finger on the screen, it reacts as if you have disturbed the water above the pebbles.
The Surface device currently costs between £5,000 and £10,000, but Microsoft hopes it will be in homes in around three to five years.
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