Enlightened rants...

[pocaracas]

Or maybe the eye developed an affinity to the world around.
To find bounty in beauty.
And to flee ugliness.

Let's consider "eating junk food" to be the example here;experts say:

http://jamesclear.com/junk-food-science

Memories of past eating experiences. This is where the psychobiology of junk food really works against you. When you eat something tasty (say, a bag of potato chips), your brain registers that feeling. The next time you see that food, smell that food, or even read about that food, your brain starts to trigger the memories and responses that came when you ate it. These memories can actually cause physical responses like salivation and create the “mouth-watering” craving that you get when thinking about your favorite foods.

What is the memory that humans have, that keeps them coming back to the cosmos?
Just like junk-food addiction, we're addicted to thoughts of celestial bodies and entities. Non-religious people might replace "angels and demons" with "little green men from other galaxies", we don't have the same craving for "the underground" per say; oceans do not witness the same spending that outer space exploration is witnessing.

We crave thinking about the high levels of the universe; no matter what. Atheist or religious; it becomes a matter of names: aliens, God, Gods, angels, demons, are we alone? "we are not sure"...

And I'm not sure what that has to with "the observed realm is attractive to the eye", but oh well...

Curiosity is what propels mankind towards the cosmos. We do not know, but we want to know. We want to know everything that there is.
Some of us fear the unknown, some want to keep it unknown.... and some want to push the barrier of the unknown as far away as possible.
Until we know for sure, many will speculate on what will be found. If little green men, or tall grey ones... we'll see if any at all... or maybe mankind will never find out for sure... we don't know... but we'll never know, if we don't keep pushing.