Into thin air

Heliodisplay is not really new, but I only found it this morning on Hideous Pursuit.

The air coming into this "Interactive free-space display" is modified, ejected and illuminated to project TV, streaming video and computer images into space. You can walk around, or even through, the floating image and interact with this sort of virtual touchscreen: a hand or finger can act as a mouse that navigates and selects.

Demo video.