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.
|"Blood from young mice reverses ageing in old mice."|
|Japan eyes solar station in space as new energy source|
|Why is the Sky Dark at Night?|
|Insect With Built-In Mechanical Gears|
|Paul Revere's Midnight Ride Effect|
|Time Lapse of Planet Earth as Seen from the Space Station|
|“A short cut through spacetime allowing for travel over cosmic scale distances in a short period.”|
|CaptchaTweet: Write Tweets in Captcha Form|
|“If you fell asleep in 1945 and woke up in 2018 you would not recognize the world around you.”|
|The (Very Scary) People of Public Transit|
|How to Avoid Jury Duty|
|“Reliably bottling up miniature stars, inside complex machines on Earth, demands otherworldly amounts of patience.”|
|Read Advice People Wish They Had at Your Age|
|Timelapse of a Tesla Model 3 Being Made|
|Recycled Vacuum Lamps|
|The Racist, Sexist Tendencies of AI|
|Walking Car Concept|