How does sticking weirdly shaped foam blocks on the walls of a room make noise hard to hear from inside and out?
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So the weird pointy shape of the blocks and soundproof rooms is 100% designed to absorb all sounds.
If you stand in an empty room, you can hear the echo of your voice. Basically, the sound you make bounces on the wall back into your ears. Exactly like light bounces on a mirror allowing you to see things that are at an angle compared to you.
Now if your wall is flat, a lot of the reflected sound will reach you. If you change the angle of the wall, for example, by adding many tiny pyramids to create a lot of angles, the reflected sound will not bounce back towards you, but towards the rest of the pyramids. If you also make these pyramids in foam, most of the sound is absorbed by the foam and the only limited reflected sounds are reflected towards more foam, and you now have a soundproof room.
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