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Egg boxes (as shown) do help a bit to soundproof a room, though not a lot! The main reason people stick egg boxes on walls of a room (other than being rather eccentric and/or having a very understanding wife/husband/partner) is to reduce echos and resonances at particular frequencies. The surfaces of eggboxes are uneven and angled and absorb the sound rather than reflecting it as a plain wall would. It is a poor man's anechoic chamber. They do not have much effect at the lower frequency end which is the sounds that tend to pass through walls and annoy neighbours.