Playing the violin entails holding the instrument between the jaw and the collar bone (see below for variations of this posture). The strings are sounded either by drawing the bow across them (arco), or by plucking them (pizzicato). The left hand regulates the sounding length of the strings by stopping them against the fingerboard with the fingers, producing different pitches. Posture It is possible to play the violin holding it in a variety of ways. Most players hold the lower bout of the instrument between the left shoulder and the jaw, often assisted by a semi-permanently attached chinrest and detachable shoulder rest. If held properly under the chin, the violinist can let go of the instrument with their hands and it will stay there firmly. Other common ways to hold the instrument include the seated Carnatic attitude, with the scroll resting on a foot, or the dancing-master's "kit" or "pochette" hold, along the forearm, by the lower margin of the rib cage, even though these are not widely traditional holds. In Morocco the violin is often held completely upright resting on the seated player's thigh with the left hand stabilizing the balance while fingering. The chin rest and shoulder rest accessories come in a great variety of styles and shapes, so each individual may find the combination that best suits their build and playing style. The search for the ideal combination can be a lengthy one in some cases. Whatever the equipment, the player will usually aim to maintain a balanced, natural, and comfortable attitude, with the spine straight, especially the neck. Many violinists have a reddish mark on the neck, the so-called "violin hickey" (or "fiddler's hickey") from long-term pressure at that spot. The spot may be aggravated by an allergic reaction to nickel plating on the chinrest clamp hardware, or by microbial pathogens present on the instrument. Keeping the left wrist relaxed and nearly "straight" allows freedom of finger motion, and reduces the chance of repetitive strain injury. Collapsing the wrist to "support" the violin with the heel of the hand is an unfortunate habit that many novice players fall into, and may take years of constant vigilance to overcome. The left forearm will be rather extremely supinated, and the left elbow drawn medially, or to the right. Players may sometimes be advised to bring their left elbow to where they can see it, so as to reach