The art of swinging the ball contrary to how a conventionally swung ball moves in the air; i.e. movement away from the rough side. Many theories as to how this may occur. Usually happens with an older ball than conventional swing, but not always, atmospheric conditions and bowler skill also being important factors. It has been espoused that once the 'rough' side becomes extremely rough a similar effect to that of a dimpled golf ball may cause it to move more quickly through the air than the 'shiny' side of the ball. Invented by Pakistani fast bowler Sarfaraz Nawaz and later perfected by the likes of Imran Khan, Wasim Akram and Waqar Younis.