At 29,028 feet up in the troposphere, so little oxygen was reaching my brain that my mental capacity was that of a slow child.
Jon Krakauer -- Into Thin Air
…normally capable of sustaining an atmospheric pressure of 19 tons, when elevated to a considerable altitude in the terrestrial atmosphere suffered with arithmetical progression of intensity, according as the line of demarcation between troposphere and stratosphere was approximated from nasal hemorrhage, impeded respiration and vertigo, when proposing this problem for solution, he had conjectured as a working hypothesis which could not be proved impossible that a more adaptable…
James Joyce -- Ulysses
It’s so easy to fly, and I rise over evergreen spires, granite cathedrals, slip into the troposphere, surf vertical winds, still seeking …. Voices.