The walls of “Cueva de las manos” (Cave of the Hands) in the province of Santa Cruz (Patagonia, Argentina) are covered with negative impressions of hands dated over 10,000 years back, though their significance has never been quite clarified. Maybe this cave of difficult access, located near Rio Pinturas, was a place of rites of passage and the hand impressions belonged to those who freely and solemnly swore to abide by the rules of the group.