Solargraphy is a semi-analogue photographic technique that uses a simple pinhole camera to capture the sun's path across the sky during an extremely long exposure period.  The resulting image, a solargraph, depicts each day's sun as a single streak across the sky and any stationary landscape features as ghostly artifacts.  Unlike traditional analog photography which requires chemical processing to develop the image, solargraphy is easy to do and very accessible.

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A solargraphy camera can be made from any type of weather-proof, light-tight container like a candy tin or beverage can.  Light enters the camera only through a tiny pinhole.  The camera is mounted outdoors for an extended time period (usually several months) to allow it to capture and record the sun's movement on a piece of light-sensitive paper.  Because the exposure time is so extreme, the image is essentially burned into the paper.  And only some simple digital manipulation is needed to view the image.