Little Hawk mentions goldfish above so I want to go with that image for a moment. The concept, of course, is not original with me.

Goldfish do not have legs, they don't breathe air, they look pretty much alike and are fairly uniform in size, their memory probably is fairly limited and their aspirations for the future also. In all likelihood, they don't have much idea of where they came from or where they go when some are 'fished' out of the bowl. Except for occasional glimpses of us - their keepers - they don't have much of a framework of reference to us.

Imagine us - mankind - in a goldfish bowl. We breathe air. We have legs. We look pretty much alike and are fairly uniform in size. For all we know when judged by someone 'out there', our memory and aspirations are extremely limited. And frankly, we don't know where we came from nor do we know where we go when we 'disappear'.

And except for occasional glimpses we don't have much of a framework of reference to any being 'out there'.