~2000 years ago a wise man said "If what can be seen is obscure to you, how can you comprehend what cannot be seen?" (Book of Thomas 2:3)
This statement captures the essence of "perception": the main function of perception is to increase Understanding of what you perceive.
Those who cannot appreciate and comprehend what is in front of their noses - they have no chance understanding anything else. No chance....
I heard about a Russian physicist who decided to die clinicallly and come back to life because he wanted to explore a structure of atom - something you cannot perceive when you are in your physical body and/or have instruments made of atoms. When he came back to life after his ~20hour "trip" he admitted that what he "perceived" about atom did not make any sense to him. He said that it was unlike any theory that exists on Earth.
He did not use drugs to induce clinical death (he used dry fasting, technique used by Tibetan lamas in the advanced stages of their training for many thousands of years) but the advice of the wise man ~2000 years ago still holds: "If what can be seen is obscure to you, how can you comprehend what cannot be seen?"
We all have eyes, but do we see ???