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Comment by bottled_poe | Hacker News Reader

It looks amazing - almost too good to be true. The low lighting in the video make me feel like there is some kind of trickery happening here. I don't find it is surprising that their indiegogo campaign has been started without revealing technical details. It all just makes me a bit suspicious about the technology... I would love to be told otherwise.

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It's definitely real. I've seen it, and no doubt so have many many others. As someone else here speculated it's a transparent screen moving up and down over a projector. It's pretty cool and worked in a reasonably light environment.

"The device contains a projector that beams an image up onto a screen, which in turn vibrates up and down at a rapid speed."

http://www.extremetech.com/gaming/174772-voxiebox-a-real-lif...

That doesn't sound as impressive as a thin-air holographic projection.

I suggest you stick with your current thin-air holographic solution if you have one :)

Well, this one literally does it with thin-air:

https://www.youtube.com/watch?v=KfVS-npfVuY

That has minor issues. Such as ozone not being good for you. Ditto, lasers powerful enough to ionize air. Also, the noise created.

Still intriguing though!

Theoretically?

Some gas / dye that emits light (or even just becomes opaque) above a certain level of incident radiation, and two scanning lasers.

But as usual, in theory != in practice. Trying to get something that's safe, won't dissipate too quickly, and isn't opaque...

Air itself would work, but there's this minor matter of "ozone, and lasers powerful enough to ionize air, isn't the best for you".

I wonder if one could stimulate condensation... Though then you'd probably get water on things.

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