" But as almost all objects differ in some qualities and almost all have some qualities in common, it follows that, contrary to common belief, there is no one classification absolutely essential to any group of objects.
An infinite number of classifications may be made, because every object has an infinite number of attributes, depending on the aspect we take of it. Nor is any one aspect of a thing "truer" than any other. The aspect we take depends entirely on the purpose we have in mind or the problem we wish to solve. "

― Henry Hazlitt , Thinking as a Science