two-dimensional figure representing a projection of a three-dimensional object that cannot exist
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An impossible object (also known as an impossible figure or an undecidable figure) is a type of optical illusion that consists of a two-dimensional figure which is instantly and naturally understood as representing a projection of a three-dimensional object but cannot exist as a solid object. Impossible objects are of interest to psychologists, mathematicians and artists without falling entirely into any one discipline.
Notable examples
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).