A Japanese company has recently demonstrated a system that displays simple 3D images in the air. They claim it is the first such system that does not need any type of screen to achieve this effect.
Three dimensional images suspended in the air are one of those science-fiction tropes that we’ve seen for countless years and should be (unlike faster than light drives and teleportation) fully realizable one day. The most famous example of this has to be the iconic image of R2D2 projecting the image of Princess Leia at the beginning of Star Wars: A New Hope. In one form or another, 3D images have existed for quite a while but most recently, a 3D renaissance (that no one really cared about) swept the flat-screen tv industry. This technology and the types used in the movies can be impressive but it’s still not Leia. It’s pseudo-3D, just tricks and optical illusions on a 2D surface. A true 3D image suspended in the air has been attempted as well and some looked promising but they still mostly depended on the light reflecting off some surface even if it were a misty cloud in the air. Cool but not quite what we really want.