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Anyone who has played the parlor game of “20 questions” knows that it is possible to identify one of a large number of events or things through the answers to 20 questions. The exact number will depend on the number of alternative answers permitted for each question. If there are only two alternatives for each, then the total number of identifiable events will be 2 raised to the twentieth power (220), which is 1,048,576. This implies that over a million separate and distinct events or things can be uniquely classified by 20 such questions.
In 1962 de Rivera proposed a novel abstract classification system for emotions that was, in essence, based on the