A wooden chair is positioned for you here. What do you think it feels like?
Do you remember, when you were a child, the things in your environment that only you could see? Do you remember that even your own eyes are just a big illusion after all?
In this case, no experience is needed, the image has already been supplied by the brain. What more can we say about the effect of the sun on a still crystal clear sky?
Transparent waves of light stretch out all around the outside of the eye like curtains, which let only the most distant things in. Transparent waves of light are like a glass plate placed on the counter that only receives light from behind.
A perfectly clear glass plate is always a mirage.
The muscles of the eye are relaxed when at rest, like the muscles of a jellyfish.