Heating, Ventilation and Air Conditioning

So it is with air: there is the brightest variety which we call aether, the muddiest which we call mist and darkness, and other kinds for which we have no name...

Darius was clearly of the opinion
That the air is also man’s dominion,
And that, with paddle or fin or pinion,
We soon or late
Shall navigate
The azure, as now we sail the sea.

My highway is unfeatured air,
My consorts are the sleepless stars,
And men my giant arms upbear—
My arms unstained and free from scars.