A doll is a model of a human being. Dolls have been around since the dawn of human civilization, and have been fashioned from a vast array of materials, ranging from stone, clay, wood, bone, cloth and paper, to porcelain, china, rubber and plastic. While dolls have traditionally been toys for children, traditionally seen as a girls toy, they are also collected by adults, for their nostalgic value, beauty, historical importance or financial value.