I remember reading about a project in BYTE in the early-mid 80s where you could make a camera from memory chips that had a metal lid rather than being encapsulated in a monolithic plastic case. With a clear lid the dynamic RAM matrix became light sensitive and could be read out as grey levels. The whole thing was fiddly and required a LOT of circuitry for interfacing.
Now you just buy a $10 webcam and plug it into your USB port...
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