Signs
Outside our windows we don’t have any signs…posted limits are either red lines on our gauges or numbers in our heads…Similarly, the aerial horizon is clear and consistent (albeit ambiguous), a hazy line that separates earth and space…But, below the horizon, we frequently see signs that we we may recognize, if we stop for a moment to interpret them. Flying through the Cascades in Washington, we look down upon South Twin and see its snow-covered face set incongruously among green mountains and hilltops…we see signs of a season about to change. Welcome autumn, winter is coming.
The Aerial Horizon 
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