Reflected acoustic wave

How effectively a wall "stops" sounds and prevents them from traveling further.

In the chaos of the sounds surrounding us – the rustle of the wind, the buzz of the street, or the cracks – our brain has an extraordinary ability to catch order. It is this order that makes us perceive some sounds as "musical," pure, and pleasant, while others are perceived as formless noise. The key to this harmony is repetitiveness, which is a feature that defines periodic sound.

Does 1 plus 1 always equal 2? In acoustics, sometimes adding two sounds results in perfect silence.