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Message: <blockquote data-quote="Celebrim" data-source="post: 5174850" data-attributes="member: 4937">But it's this sort of argument that almost convinces me to agree with the OP.What's a play?  Not a book.  In fact, telling me what a book is helps me nothing with what a play is.  In the above statement, not only are your assertions about what a play is arguably and insufficiently inclusive (plays are rarely read, they are sometimes unscripted, and are sometimes silent), but the addition of telling me that it is like a book adds nothing to the idea of people talking and acting out the part of the characters. And similar things are true about the rest of your examples.I suspect that this is because they all belong to the same superclass.  They are all related.  But comparing child/inherited objects to another is fraught with danger.</blockquote>