No one likes a cloudy sky. A cloud on the horizon is seen as a harbinger of doom. We feel like clouds need to have silver linings.
But here's our thesis: Clouds are unfairly maligned.
Consider this: From almost any vantage point (literally -- any vantage point in the universe), clouds are planet Earth's defining characteristic.
They're what changes, what moves. They're what's going on on our pale blue dot.