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FogScreen
"A thin curtain of 'dry' fog that serves as a translucent projection screen, displaying images that literally float in the air. ... Using nothing more than tap water and ultrasonic waves, FogScreen projection screen machines employ a patented technology to create a smooth foggy airflow that captures images just like a screen." From an innovation technology company headquartered in Helsinki, Finland.
http://www.fogscreen.com/en/

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