Projecting onto thin air?!?

IO2 Technology :† Heliodisplay- Interactive Free-Space Display

From the site:
The Heliodisplay projects full color streaming video into free space (i.e. air). It is plug-and-play compatible with most video sources (TV, DVD, computer, etc.). These non-holographic images can be fully interactive, allowing a hand or finger to select, navigate and manipulate — as if it were a virtual touch screen.

How does it work…?

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