The Camera Obscura
The camera obscura is the Latin word for "dark room". The camera obscura is a device that makes use of an optical phenomenon in which light rays reverse themselves when they pass through a small aperture. At its most basic, light rays pass through a tiny hole and recreate themselves upside down on a screen that is placed parallel to the hole.
The images above shows the effect you will get when you do the camera obscura experiment. As you can see the image that is being projected is the image that is outside the hole that has been made. For a better effect it is better if you do this experiment in a dark room as the image that is being projected will become more clear and sharper.