全息图是怎么实现的？

3Blue1Brown explains how holograms record a 3D scene on 2D film, using wave diffraction and phase. The video includes demonstrations of several real holograms.

Why HN likes it: HN commenters call it the best explanation of how holograms work, and one says it transformed their understanding.

“this might be one of my most favorite videos ever single-handedly changing my understanding of holograms”