Shadow of horizon

I've found interesting topic on this forum about shadow of horizon.
"If sun never goes down, never sets or rises, why horizon casts shadow on mountains and buildings behind you?"
People don't know how to explain that.

In other words, if the distance that light travels is limited, and you don't see sun when is far enough,
why are objects even further behind you still illuminated?
And why only upper part?
Light can't reach you directly, but can reach 2 miles behind you and another 2 miles back to your eyes?

I've found interesting topic on this forum about shadow of horizon.
"If sun never goes down, never sets or rises, why horizon casts shadow on mountains and buildings behind you?"
People don't know how to explain that.

In other words, if the distance that light travels is limited, and you don't see sun when is far enough,
why are objects even further behind you still illuminated?
And why only upper part?
Light can't reach you directly, but can reach 2 miles behind you and another 2 miles back to your eyes?

A bit like this?

The sun shining up onto the underside of the clouds in?
And there are photos on this site of the sun rising behind Mt Ranier:
Gorgeous sunrise over Western Washington, Photo: Bradley Castaneda (and others)
And And this is worth a look. It's video on Vimeo:

Yes, I've seen those too.

But I was simply thinking of some sky scraper hotels on beach in Hawaii, with shadow of horizon partly covering them for sunset.
And of hills behind, also partly covered with that shadow.

Interesting... Someone will have to help me find a time lapse video of the Chicago skyline from the east at sunrise on a clear day. I found two that showed the sunlight brightening halfway up then rolling down. Couldn't find one that lit from the top down. But hey, I'm no googlist.

I will have to make that a goal this summer.

Also couldn't find one for any open ocean oriented cliff face that I could rule out cloud diffusion at daybreak.