Where's Nathanael

I think I now know why (after 5 children) that young children only think you can see them if they see you. We teach them that at an early age....I was playing the game where you throw a towel, washcloth, small blanket (something light that won't suffocate them) etc over your 1 yo face and say "Where's Nathanael?" you or he pulls it off and says "There he is?" and they love it, but they also can't see you and probably think that you can't see them. Well it's a theory anyway!