For a while now I have been looking for a way to visualise things for gaming purposes. For example, if your character is sitting out three thousand feet from a cave and a figure comes out of the cave how "big" does that figure appear to be? Likewise, how big of a target is a robot coming in from a mile out? You can do it in the inverse too. Your character is stranded on an island. They want to make an S.O.S. on the beach out of rocks and branches. How big do you have to make the letters to be seen by a search plane?