On a purely mechanical and biological basis, what our unconscious mind does is it takes a crude visual inventory that’s registered by the retina. Then the brain will attempt to process it, and present the data of what it thinks it sees to the conscious mind, supplying a detailed image of the object or event.
So what your mind actually may perceive and what is actually real, may not always be a direct image of what’s really there. It’s rather an image that’s constructed by the mind from the information …