Weak Knees and Illusion
Whether on the rim, weak-kneed by our proximity to the void that separates us from the dimensionless landscape below, or sitting comfortably in the back seat of an airliner eight miles above, flowing confidently through that same void, we marvel at the fluid power of earth to alter reality and perception…still farther away, the sun teases us with light and shadow, forever confusing our senses and making earth seem anew as her colors change with the varying wavelengths of light and the variable density of the atmosphere…In this place we momentarily comprehend that all that surrounds us is an illusion.
The Aerial Horizon 
Illusion, perhaps, but it is real enough as when one falls on hard rock whist hiking.
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