String art usually refers to an arrangement of string that forms abstract geometric patterns or patterns that resemble an object, such as a ship's sails, sometimes with other artist material comprising the remainer of the work. The string may be wound around a grid of nails that are hammered into a velvet covered wooden board. Though straight lines are formed by the string, the slightly different angles and metric positions at which strings intersect may give the appearance of Bézier curves (and often construct actual quadratic Bézier curves). Other forms of string art include Spirelli, which is used for cardmaking and scrapbooking, and curve stitching, in which string is stitched through holes.