For all you know, the screen you're about ... and use their fingers to swipe through the selections, one traveler was recently spotted using his FOOT to operate the touch screen.

The catch is, that the second you try to interact with the hologram, you might lose a finger or just break the machine entirely ... to with your phone's touch screen – swipe, touch-to-select ...

These hands-on displays might be used to create more immersive video games, educational tools and museum exhibits.