The Sentinelese reside in small temporary huts erected on four poles with slanted leaf-covered roofs. They recognise the value of metal, having scavenged it to create tools and weapons and accepted aluminium cookware left by the National Geographic Society in 1974. They have also developed canoes suitable for lagoon-fishing but use long poles rather than paddles or oars to propel them. They seldom use the canoes for cross-island navigation. Both sexes wear bark strings; the men always tuck daggers into their waist belts. They also wear some ornaments such as necklaces and headbands, but are essentially naked. The wearing of jawbones of deceased relatives has been reported. Artistic engravings of simple geometric designs and shade contrasts have been seen on their weapons. The women have been seen to dance by slapping both palms on the thighs whilst simultaneously tapping the feet rhythmically in a bent-knee stance.