 Why does the party run into duplicates of themselves?
[Transcriber's Note: This etext was produced from Planet Stories Spring 1945. They rose straight up like enormous cat-tails, with only a melon-shaped protuberance at the top to show they were a form of vegetation. He could be excused this time, however, for this was only our third day on Jupiter's Eighth Moon, and the country was still strange to us. So now here we were at the outer reaches of the Baldric, four travelers on foot with only the barest necessities in the way of equipment and supplies. Apparently these adjustments moved planes or fins on the kite and accounted for the car's ability to move in any direction.
 They're the cockatoos, copying their appearance.
 It's the Red Fever influencing their perception.  As Grannie Annie says, it's a form of mass hypnosis.  They're a mirage, a result of the Baldric.  They're the cockatoos, copying their appearance.