A sundog seen from a plane can suggest a spectacular and fantastic structure, like the one reported over Rheims, France, at 2:30 P.M. local time on March 31, 1960. The pilot and crew of a C-47 plane described the unknown as like a gigantic spool of thread some twelve feet tall. The neck of the spool, about six feet in diameter, seemed to be capped at top and bottom by disks eight or ten feet in diameter. The upper disk was reddish, the lower, blue-green. The plane was flying at 6000 feet and had just passed from a storm area into a region of calm with unlimited visibility. The UFO remained in view for about sixty seconds, then suddenly vanished. From an analysis of the data, the position of the unknown relative to the sun and the observers, and the weather situation, Air Force investigators positively identified the object as a mock sun[XII-1]. One of the most recent sightings of this type occurred on October 2, 1961, a few minutes after noon[XII-1]. A civilian pilot who was just taking off from the Utah Central Airport at Salt Lake City noticed a bright silvery disk in the air ahead of his plane. He supposed it to be another aircraft crossing his course. When he was air-borne, he was surprised to find that the object, now an elongated pencil shape, still appeared in the same position where he had first seen it and hence could not be a plane. Puzzled, he radioed the control tower and reported the UFO. Looking south as directed by the pilot, the tower operator easily found the object, a bright spot in the sky directly below the sun and apparently hovering over the town of Provo, forty miles to the south. Deciding to investigate, the pilot left the traffic pattern and started directly south after the UFO. It seemed to be standing practically still in the sky, with a little rocking motion, at an altitude of 6500 to 7000 feet. He seemed to have approached within three to five miles when the UFO suddenly shot up “like an elevator” and retreated rapidly south, as though taking evasive action. The acceleration was tremendous, almost as though the UFO had been fired from a rocket, but there was no vapor trail and no sound. It then disappeared, gradually. “It just faded out. I kept my eyes glued right on it because I could see it was moving away at a great speed. I wanted to see how long it would take and it was just a second or two until it had faded completely. And it was getting smaller all the time, you could see it was moving away.” The speed of departure, the pilot estimated, must have been thousands of miles an hour. Alerted by the pilot’s message to the control tower, several persons on the ground at the Salt Lake City airport, most of them with experience as pilots, had also been watching the UFO. Ground observers at the Provo airport, also alerted, were not able to locate the unknown, even though they had been told it was almost directly overhead.