as an audio engineer, it reminds me of something called phase cancellation which is when one signal cancels out the other - basically when you combine one sine wave or frequency with the exact inverse (or opposite) then it is cancelled out completely. this is also similar to how noise cancellation works on headphones that have that feature. I’m not sure that this is the same thing or if that’s what it’s demonstrating, but that’s what it looks like to me.
also, I’ve been seeing 108 everywhere. I just picked this up and got the 108th copy!