Originally, ear can hear anything, but human ear is not.
It hear at the silence. It doesn't hear on the front of somebody.
Originally, eye can see anything, but human eye is not.
It see at the empty. It doesn't see on the front of nature.
I think that all of animals except human can see and hear everything.
Only human can hear what can't hear.
Only human can see what can't see.
Because we are in the cage of ego.
We are suffering in the cage of ego, however key is on the hand.
Maybe, we should know the out of the cage.
If we realize what it is, we can open the cage by the key by ourselves.
We do not only have the bravery to go out of the cage. I thought so.