If we contemplate the three marks of emptiness (change,
dependence, and impermanence) we discover that the sonic domain
most clearly presents us with the nature of emptiness in a manner
directly accessible to our sensory awareness. Other sensory domains
do not exhibit so clearly these three marks of emptiness, these
three marks of existence. For example, most objects in the visual
domain do not seem to change in a manner directly available to our
senses. The desk I sit at right now does not seem to differ from
the desk I observed yesterday. I infer that it has changed and I
can establish, through practice, a profound inferential
consciousness with regard to the changing nature of visual
phenomena. However, I do not directly perceive this changing nature
of visual phenomena. Similarly, visual phenomena do not display to
my senses their dependent nature; visual phenomena seem to exist as
independent and separate entities. Once again, I can infer the
dependent nature of visual objects (for example I infer that the
desk came from a tree, from a furniture maker, from a truck that
delivered the furniture, etc.), and this inferential consciousness
can, over time, provide a strong foundation for the understanding
of emptiness, but the visual domain does not, for the most part,
provide a basis for experiencing emptiness.
http://nichirenscoffeehouse.net/dharmajim/sea-of-sound.html
taken from the Perfection of Wisdom Translation by Edward
Conze