 Why is the narrator the only one who notices a flight of volplas soaring slowly across the full Moon?
Volpla By WYMAN GUIN Illustrated by Volplas at last. Yet I had always been so sure I could create them that I had been calling them volplas for ten years. I had called them volplas since the day old Nijinsky's elongated arms and his cousin's lateral skin folds had given me the idea of a flying mutant. Again in the laboratory, I entered the metabolic accelerator and withdrew the intravenous needles from my first volplas. It would be several hours before they would begin to move, to learn to feed and play, perhaps to learn to fly. Meanwhile, it was clear that here was no war of dominant mutations. I kissed her until I heard rollerskates coming across the terrace from one direction and a horse galloping toward the terrace from the other direction.
 Because people generally only notice what they look for and would dismiss the phenomenon as something else.
 Because volplas are fictional creatures and people do not believe they exist.  Because other witness believe this was ET with  a little boy riding his bicycle over the moon.  Because people generally only notice what they look for and would dismiss the phenomenon as something else.  Because it is nighttime and everyone is indoors.