Understanding is an illusion mostly created in our brains. Color has no meaning until processed by our eyes and is sent on as signals to the back of our heads. Smell, taste, touch, hearing, all of our senses are merely chemical electric impulses sent through our nerves to the brain that then interprets all the confusion of signals. Add into that mix hormones and other vague sensations the body uses to message that chunk of gray matter in our heads that turns all those chemical electric signals into, what we understand to be, our own reality. Of course, none of that would make any sense without the great store of previous experience pre-written before that instant of awareness we call the present.