Childlore is a distinct branch of folklore that deals with activities passed on by children to other children, away from the influence or supervision of an adult. Children's folklore contains artifacts from all the standard folklore genres of verbal, material, and customary lore; it is however the child-to-child conduit that distinguishes these artifacts. For childhood is a social group where children teach, learn and share their own traditions, flourishing in a street culture outside the purview of adults. This is also ideal where it needs to be collected; as Iona and Peter Opie demonstrated in their pioneering book "Children's Games in Street and Playground". Here the social group of children is studied on its own terms, not as a derivative of adult social groups. It is shown that the culture of children is quite distinctive; it is generally unnoticed by the sophisticated world of adults, and quite as little affected by it.