the camera obscura
Here a youtube and picture
The video on the right shows a group of people attempting make a camera Obscura in an office inspired by the work of Abelardo Morell and they making the room entirely light safe (completely dark) by a taping black sheets to the windows. They then cut a small hole to let in a stream of bright light and an upside down image appears on the opposite wall and the reason is this happens is because light travels in straight lines.
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