This is something I've wondered for a while. Those with knowledge on electromagnetism know that visible light and illumination do not exist as they are perceived in the external world. They are simply non-colored non-illuminated waves of energy traveling at varying frequencies. My question is that since visible light and illumination do not exist within physical reality, yet we experience an illuminated and colored image all during our waking lives, where is this actually being experienced? Your brain is enclosed within a skull, it is pitch black within your head. If you slice open your brain it will simply be a lump of grey matter, no images, no color, no light. So if this image we are always experiencing does not exist within our brain, and cannot exist within physical reality, where is it that our brains are linked to that we do experience this?