The hand-wound mechanical movement is perhaps the most classical of movements. It operates exclusively by the daily (or sometimes more often) winding of the crown to power the mainspring (the “heart” of the movement). Unlike its automatic mechanical counterpart, this type of movement does not feature a rotor. The energy source is the mainspring (a spring coiled into a tight spiral) which is wound manually by the wearer twisting the crown, usually in a clockwise direction. As time progresses, the spring begins to uncoil, releasing the energy needed to activate the various wheels and make the movement tick. Without routine winding of the crown, the hand-wound mechanical movement will eventually lose power. Thus, mechanical hand-wound movements usually require daily winding. A hand-wound movement requires greater care than almost all other types of movements because once the mainspring is fully wound, additional tension may cause it to break.