It follows that if other people are only present in order to create the impression of a well-stocked and populous planet that some arrangements have to be in place to account for them when the scenery viewer does not require their presence. There are a variety of schools of thought on this issue. The original and most popular idea is “all the world’s a stage” whereby the other people of the world wait until you’re just out of earshot or eyeshot before stopping what they were pretending to be doing until they were next required…