Illusion or trick of mind
I love optical illusions. I can spend days just looking at them because they fascinate me. Our worldview, as it were, is constrained by our senses. What is physical and what is not. Descartes obviously had something to say about that. Yet, I am a firm believer of the tangible.
But once in a while, science and physical senses cannot seem to prove what is not there. If it does, it seems out of whack with our senses.
Take for example this
The dragon is merely a paper foldup. Yet, it seems to follow you whereever you look at it. Freaky but the explanation, according to this guy, is that we misperceive the dragon’s shape. Check his post here
Anyway, if we cannot trust our senses, what can we trust?