When my daughter was two I had this 3little pigs mask for Haloween. I'd put it on and she'd howl. Take it off and she'd giggle. It was like "there's daddy now". I put it on and off half a dozen times but she never made the connection that it was still me. I found out this type of reasoning doesn't fully develop until about age six. My point is, there are things she saw that she just couldn't perceive. It's not that big a leap that there might be things going on around us that we just haven't been built to notice. We also get trained from an early age about what's real. I think Verne wrote a story called "in the Country of the Blind" . Its about a mountain climber that stumbles on a shangra la filled with blind people. He decides that he's going to prove what a wonderful thing sight is. He winds up tripping and stumbling because the homes have no windows. He can't hear people's hands or sleves rustle well enough to take food from them. Finally the townsfolk decide to put out his eyes to heal him of his delusions. That's human nature, don't be different.