A stressed syllable or ictus. These alternate with unstressed syllables or slacks to produce a theoretical metrical pattern termed the rhythm that often, but not always, matches how the line would be sounded in conversation. Prominence can be achieved by pitch (tone), loudness or impact (stress), or length. An increase in pitch usually creates stress. George Puttenham in 1589 says: "To that which was highest lift vp and most eleuate or shrillest in the eare, they gaue the name of the sharpe accent, to the lowest and most base because it seemed to fall downe rather than to rise vp, they gaue the name of the heauy accent, and that other which seemed in part to lift vp and in part to fall downe, they called the circumflex, or compast accent: and if new termes were not odious, we might very properly call him the (windabout) for so is the Greek word."