In the case of identifying an apple in pictures, the images get filtered down over and over, with initial layers showing just barely discernable parts of an edge, a blip of red or just the tip of a stem, while subsequent, more filtered layers will show entire apples.
We kicked off with a supremely awkward group number (what else is new?) in which the final 12 performed Lady Gaga's "The Edge of Glory" with no discernable sense of timing or harmony.
In many frames of Pileated Woodpecker, a black trailing edge to the wing is discernable (though due to bleeding of white as a video artifact, it appears narrower than it really is).
However, analysis of the bird in the Luneau video in light of images of known Pileated Woodpeckers confirms that a similar black trailing edge to the wing is discernable in some frames of the Luneau video (compare Figure 1B, frame 775 with Figure 1A, frame 366.7: the apparent plumage patterns are similar, and inconsistent with Ivory-billed Woodpecker).
This process, of the elimination of any kind of discernable difference, results in that which exists at the edges of culture being forced ever-further-outwards.
On a day in which, so far, the only discernable action has been the downing of a rebel plane on the eastern edge of the city, seemingly by friendly fire, the celebratory mood might seem somewhat misplaced.
But there may be one discernable difference between the two.
The United States has never played with a consistent, discernable style.
Thus we see that the science fiction novel is hardly a judicious study of discernable reality, but rather the realities discernable through a capricious temperament.
