From a human point of view it's largely subjective...

The old classic, If a tree falls in a forest, does it make a sound if no one is there to hear it?

Of course it does not... A three dimensional compression wave will of course still propogate in the time domain, but sound is an observation... If a dog is in the forest, the compression wave will be interpreted as a dog sound, if a man is in the forest, it will be interpreted as the human sound that we know and love...

And sight is exactly the same... our eyes and minds interpret propogating light beams as colour and form... The truth is that solid objects are comprised for the most part of empty space...

Touch Smell and taste, are a response to stimuli which serve little purpose in terms of providing information about reality except to help us to avoid injury and unhealthy miasma...