Researchers at the Keio University in Japan have developed a new 3D display that displays floating 3D characters that can be interacted with and touched in mid air.

The RePro3D display is made up of a glasses 3D display, a mechanically controlled model environment and a tactile interface, have a look at the video of it in action below.

"We use retro-reflective projection technology, using materials with special retro-reflective characteristics. This kind of material reflects light that enters back at the same angle it entered. Using this technology enables a display to show images at a different place from the light source.”