How to make a three-dimensional effect on the stage of the Spring Festival Evening?

Baba said that this is called "holographic" holography, which refers to a technology that allows the diffracted light emitted by an object to be reproduced, with the same position and size as before. (Interpretation from the Internet) Generally speaking, you can make and save all these things in other places and at other times. Then move to the stage of the Spring Festival Gala to reappear. Alas, I watched the stage of the Spring Festival Evening yesterday. It was simply beautiful!