Nature's first green is gold,
Her hardest hue to hold.
Her early leaf's a flower;
But only so an hour.
Then leaf subsides to leaf.
So Eden sank to grief,
So dawn goes down to day.
Nothing gold can stay.
Sunrise, Sunset 
 
 The most spectacular sights can line the horizon, inspiring awe for any and all spectators. 
 But two things follow: 
 
 For the sun to rise, the sun most also set. 
 People can only appreciate sunrises because of their infrequency.  If the sky were always as gorgeous as above, such an image would become ordinary and unspectacular.  “Average” and “ordinary” must exist for there to be marvels “above average” and “extraordinary.” 
 
 It is because of skies like this… 
 
 …that we can so greatly appreciate skies like this: 

Nothing Gold Can Stay