Graphic GIF demonstrating converting rotating motion to reciprocating, and/or vice versa. This is art, and, by the artist's admission, may not be technically accurate in its motion. From the excellent site of graphic artist Gareth Fowler.
https://diqn32j8nouaz.cloudfront.net...iprocating.gif
Many more nice ones, including unusual firearms and engine designs: Gareth Fowler animated mechanical illustrations
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