UFO's, for example. People see a UFO and they automatically think that it's some kind of machine being flown by some kind of being. Because all of our knowledge of large, flying objects is centered around them being some kind of machine being flown by some type of being.

Maybe that's what some of them are. Maybe some of them are something that we can't form a conception of,....or understand even if it was explained to us.

We can only understand the realities of life on the speck of dust.