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The original definition is by Michael Akroyd 1996 - Object World West Conference:
:"As a gypsy wagon or a [[poltergeist]] appears and disappears mysteriously, so does this short lived object. As a consequence the code is more difficult to maintain and there is unnecessary resource waste. The typical cause for this antipattern is poor object design." <!-- I think this is a quote -->
Gypsy wagons can often be identified by their names. Typically they are stateless "supervision" classes, used only to call methods of other classes, so are often called "manager_" , "controller_", "start_process", etc..
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