I am open to these possibilities as I am with ghosts and other such things but having never seen direct evidence of them myself I have to remain skeptical. I did see some videos on youtube regarding the Santilli telescope and the claim that it had caught images of some kind of invisible entities but I am not sure how much stock to put in these claims either.
I am aware of symbolism in historical art works such as The Last Supper by Da Vinci and also the rampant use or misuse of symbolism in modern popular culture. Movies such as Avatar and The Matrix are two obvious examples where symbolism is used throughout the narrative and in my own personal opinion, these movies give us a small glimpse into the reality of the world in which we find ourselves living, although most of us don't realise it.
I strongly believe that there is in fact a spiritual element to our lives that we have either forgotten or have been forced to forget although I have to admit that belief is not knowledge. But as you say, even if you don't know, deep down you do know. I do feel some sort of connection to source. Perhaps I need to open up my own third eye. :)