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This table-like device is Microsoft's Surface computer, which the company has been showing off in London.
It uses a 30-inch screen, several cameras, a Vista PC and a projector to create an interactive, touch-sensitive environment that reacts to objects coming into contact with its flat surface.
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.