It requires no ventilation, laughs at humidity, can easily slip behind a mirror and yet projects crystal clear video onto glass - and when it is switched off, it vanishes completely.

German tech wizards Ad Notam produce these reverse telescreens for a multitude of applications, they can even be set into kitchen surfaces and furniture throughout the house.

There are even plans for the system to be used in the 2008 season of Big Brother, so that contestants absolutely have nowhere to hide from viewers.

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