"All right.  Here it would be an hallucination... if I grok correctly that we don't stay here when we discorporate.  But in the case of Mars, there is either an entire planet with a very rich and complex civilization all run by mass hallucination - or the straightforward explanation is correct the one I was taught and the one all my experience led me to believe.  Because on Mars the 'ghosts' are by far the most important and most powerful and much the most numerous part of the population.  The ones still alive, the corporate ones, are the hewers of wood and drawers of water, servants to the Old Ones."