I dreamt that I was at a presentation by some scientist from the National Aeronautics and Space Administration who was talking about photographs of planets and their satellites. In particular, he was talking about the expectations of the general public concerning such photographs and confusions that might arise if these expectations were not taken into consideration. A satellite of another planet can always be shown not fully lit by the sun, but a planet had to be in full view. The famous photograph of the earth from the moon, where the earth was fully lit, would not make sense to most people if the earth looked to them like another but bigger and blue moon. Of course, this is how the earth actually looks from the moon most of the time, just as is the case with the moon, which is fully lit only every four weeks. The same holds for all planets viewed from close up, of course. He also compared the standard photographs of the earth, Mars, and Venus with those that rarely appear in the public domain because of the confusion they could create. Everyone would think they were photographs of satellites. When I woke up, I marveled at the precision of the dream and the beauty of the photographs. But I could not remember a single photograph of the earth taken from a larger distance in which a good portion of the planet was not lit by the sun. Perhaps the NASA scientist I dreamt about was indeed onto something interesting.