Mechanical Puzzles

These puzzles are comprised of mechanically interlinked pieces that must be manipulated in a certain way in order for them to be assembled, disassembled, and otherwise solved. The oldest known example, from the 3rd century BCE, consists of a square divided into 14 parts that fit together to form other shapes. Mechanical puzzles have since taken on myriad forms, including dexterity and disentanglement puzzles, trick vessels, and impossible objects. What is the most well-known impossible object?
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