Belly dancing gives the female body legitimization to be "round", in contrast to modern Western cultural preferences for flat stomachs. The Belly Dance is identified by swaying hips, undulating torso, and articulated isolations employed in a range of dynamic and emotional expressions. Characteristic movements in the dance include curving patterns, undulations, thrusts, lifts, locks, and drops, and shaking or quaking body movements. The focus is on isolated movements of individual parts of the body with little notice given to the footsteps. Arms and hands move fluidly, like serpents or ribbons in the air. Unusual strength and control is demonstrated in the belly area. Accents using "pop and lock" where a dancer either shimmies or makes a striking motion in her shoulders or hips are common, as are feats of flexibility, rolling one's stomach muscles, balancing various props like baskets, swords, or canes, and dancing with chiffon or silk veils.