The eye is a very interesting part of your body. In science we learned a lot of things about the eye that I didn't know before. Did you know that your eye actually sees everything upside down? Well it does. The reason you see right side up is because your brain turns the image the for you. Your iris is also a muscle that opens and closes your pupil to let in certain amounts of light. The inside of your eye is mainly clear jelly, which is very watery. The clear jelly holds up your eye, because without it your eyes would sink into your skull.