You’ve probably been using Structured Analysis and Design (SA/SD) for some years now and have been successful. There is a great deal of talk about object-oriented technology these days — especially about object-oriented analysis and design. You’ve heard the buzz words: “encapsulation,” “inheritance” and “polymorphism” and understand the advantages they bring. You’ve also heard attractive things...

A pattern of tones is explored that possesses some remarkable properties. It is heard as ascending when played in one key, yet as descending when played in another key. When the pattern is recorded on tape and then played back at different speeds, it is heard either as ascending or as descending depending on the speed of playback. As a further paradox, the pattern in any given key is heard as a...

In the course of demarcating the senses, Aristotle defined sound in De Anima as the proper object of hearing: ‘sight has color, hearing sound, and taste flavor’ (II.6, 418b13). Sound cannot be seen, tasted, smelled, or felt. And nothing other than sound can be directly heard. (Objects are heard indirectly by virtue of the sounds they produce.) All subsequent commentators agree, often characteri...