Have you ever had a dream, Neo, you were so sure was real? What if you were unable to wake from that dream? How could you distinguish between the dream world and the real world?
Most children have a monster or two – under the bed, in the closet. One of mine lurked in the huge attic fan that cooled our home during the Time Before Air Conditioning. I never walked underneath when the slats were open. The creature was up there, perched above the rumbling mechanism. Go under and it might drop down and bury its claws in you. It could pass right through the spinning blades. I knew this. But I never saw it. Because there are no fan-monsters.