How Holograms Record 3D Scenes on 2D Film

3Blue1Brown · Explainer · 46 min · 2024 · YouTube title: How are holograms possible?

Why it's here

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

What it covers

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