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.
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