The third and last is the best for those pseudo-researchers who claim alien artifacts are visible here and there on the moon. This is a close-up of Crater Delisle from photo AS15-2076. To my knowledge no one has ever commented on what is seen in this crater which has to be an optical "delusion" and so I claim its discovery. In the NASA book's description of the overall photo this illusion is not mentioned and you wonder if those tales of someone at NASA airbrushing out UFOs, etc., would not have done the same to this photo. In the book, APOLLO OVER THE MOON: A VIEW FROM ORBIT, NASA SP-362, on page 191, it is clear as a bell. What I'm talking about is the sickle-shape visible at approx. 7 o'clock. It looks like a flat sickle-shape with a handle. In the book, the photo even includes what looks like glare from metal! The photo I took shows it almost as good as it is seen in the book's photo. On websites, this illusion is not as clear and you would never notice it.