Video narration
Does your eye make the picture you experience, the way a phone camera captures an image? Light from everything around you enters your eye through its clear front, and the eye focuses it onto a thin layer at the back called the retina. There, tiny cells respond to light and turn it into electrical signals. The signals travel along the optic nerve, the pathway carrying messages from the eye to the brain. That's the handoff: light has become information the brain can use. Here's the surprising part: your eye does not send a finished picture. It sends signals. Your brain processes them, working out patterns in those signals so you experience a scene, not a stream of messages. So the eye gathers and focuses light, but it doesn't make the picture on its own. Your brain turns the retina's signals into the picture you see.