Tears in the air
There's something about photographing a tree against the sky... perhaps the grounding that it brings to the shot, or the insinuation of different elements... earth, water and air.
Or... it could also be the juxtaposition of an ever-changing sky with the slow growth of the tree, imperceptible on the same time scale.
You can apply that same concept to many other fields. After all, if you compare the lifespan of different entities on Earth, you'll see there are some living organisms that will live for only a few days, and those that may live to be hundreds, or thousands of years old.
If we were to have shorter, or longer lifespan... how would this affect our perception of the things that surround us?
And we haven't even spoken of celestial or quantum-level events...
Think about it for a moment...