my opinion
The aureal number is a proportion and is a number irrational aprox 1.61803. This proportion is the ideal or perfect for anything in the world from a landscape until the shape of your ear and therefore the most beautiful or nice to the human eye, for example, the face of a woman will be nicer for one the more you approach to this proportion. This is reflected in the art, in the nature, in the old constructions even in the decoration of your home. If you wanted to test this proportion and its beauty just suffice to compare a landscape with this proportion and one without it.