According to ScienceNews, a bunch of researchers who have been able to Princess Leia hologram scene.
This system works by trapping a cellulose particle that’s mere micrometers across in a beam of nearly invisible laser light. That laser repeatedly moves the particle along a specific path through the air, for example, in the shape of a corkscrew or the outline of a butterfly. At each point on the particle’s path, other lasers illuminate it with red, green or blue light, which the particle scatters in all directions. This creates a single image pixel that can be viewed from all sides.
Because the particle whizzes through the air so quickly and loops through the same path over and over again, all these pixels blur together — like the tip of a sparkler waved so fast that it seemingly smears into a solid line. This creates what appears to be a still image floating in the air.
|Lifeâ€™s Building Block Found in Comet|
|Bottle of Water + Microwave Oven = Dangerous Explosion|
|The Strange Powers of the Placebo Effect|
|We Almost All Died on Tuesday|
|Neutrinos: Stubbornly Disproving Einstein?|
|“If you really want to save the planet, you should die.”|
|“Cultured meat is finally on its way towards becoming a commercial reality.”|
|Japanese Robot Serves Ice Cream From Inside a Vending Machine|
|“There are but two powers in the world, the sword and the mind. In the long run the sword is always beaten by the mind.”|
|How to Avoid Jury Duty|
|Why, Typewriters Are Alive and Well, Thank you|
|CaptchaTweet: Write Tweets in Captcha Form|
|Somebody Needs to Build a New Facebook Stat|
|The (Very Scary) People of Public Transit|
|Bizarre Record Covers|
|When the Wrong Hastag Can Get You Killed by an Assassination Drone|
|“Lighter, more affordable, personal rapid transit: self-driving bikes.”|