It entails mastery of theatrical movement, body language, intonation, enunciation, and the other elements of effective public speaking. Return to the top of this page Arrangement Note that these pieces are NOT equal in length and that speeches and writings often exclude some pieces depending on their purposes and audiences. Artificial inventions rely much more overtly on an audience's opinions and beliefs. Like inartificial inventions, they also seek to establish truth, but they do so by presenting opinion rather than hard fact. Specifically, much inartificial invention is thought to be a topical invention.
Commonplaces are general or reiterated propositions.
Drugs are bad. Blondes have more fun. Looking someone in the eye means you're telling the truth. This does not necessarily mean that plain style sounds uneducated, but instead that it wraps its smarts in the talk of the home town crowd. This means that middle style sounds educated and that it puts its ideas into the voice of the six o'clock news.