Where a desert is, and a cliff, is the place where they meet. A cold air current called sa hivar blows across the plateau which is at the top of the cliff. A scorching white sun rises over the cliff, and stares down on the desert, uninterrupted by clouds. On rare occasions when sa hivar blows perpendicular to the line of the cliff, it drops down off the edge and plunges towards the shaded desert at the foot. It is cool cool air, and is much heavier than the hot air baking on the sands of the desert.
The Back-in-time bird inhabits the world on the roof of the plateau, unexplored by man. The bird flies upside down, because it is lighter than air; it isn't flying to escape gravity like the crow and the falcon, but to fight the buoyancy of the air.
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