Keychain pinhole camera
thingiverse
You've got everything with you all day, every day: it holds your keys. Load one silver paper or one film 24 by 36, plus two and a half millimeters on the borders equals 29 by 14 millimeters. It's just a humorous way to create art for old-fashioned photographs. Be cautious: I've never tried this yet. I'll make it better.
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