/sci/ - Science & Math

I saw a video on youtube a long time ago that really blew my mind but I have never been able to find it again.
A guy had one of those laser table setups and was shooting a laser at a holographic image to reconstruct it. Then he put a cup of frosted glass over the hologram source and it scrambled the projection. It turned into static fuzz. Then he did something else I don't quite recall and like magic the projection miraculously recohered slowly after several seconds. Even though the frosted glass was scrambling the data there was something about the setup that allowed it to read through the glass after a delay.

Sorry I know it's much to go off of... It just had a really profound impact on me and I NEED to see it again to understand it. How does the fastest thing in the universe take entire seconds to react and reconfigure itself like that? Haw could the information survive going through the frosted glass?