How to Project Outdoor Imagery on a Wall
The earliest ancestor of the modern camera is the camera obscura, in which a small hole in a window shutter projects a brightly lit outdoor scene onto the wall in a darkened room. A few simple supplies are all that's needed to build a camera obscura to project what is outside onto an inside wall.
Instructions
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Cover a window with cardboard, and use duct tape around all sides to block light from getting in around the edges.
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Punch a small hole in the cardboard with a sharp artist's knife, taking care to place the hole so it isn't directly behind a sash or muntin.
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Darken the room. For best results, close the door and tape the edges to keep light from getting in.
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4
Enjoy an upside-down, reversed projection of the outdoors on the wall opposite the window.
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Tips & Warnings
The more light you allow into the room, the dimmer the projected image will be. A small pinhole will create a more sharply focused image while a larger pinhole will create a brighter image.
Use the same principle to make a pinhole camera. Make a box of cardboard, replacing one side with a sheet of translucent paper or plastic. Punch a pinhole in the front of the box and see an image on the translucent sheet.