Play as a Foundation for Hunter-Gatherer Social Existence.

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Social tolerance and adult play in macaque societies: a comparison with different human cultures (2012, background): “For example, hunter-gatherer societies show a fluid structure, consensual decision making and rules for sharing that resemble those of their cooperative social play (Sutton-Smith & Roberts 1970; Gray 2009), which is typically informal and noncompetitive (Marshall 1976).”
Play, Playfulness, Creativity and Innovation (2013, background): “For example, the psychologist Peter Gray (2011) has suggested that the decline in such experience could explain why anxiety, depression, suicide, feelings of helplessness, and narcissism have increased among chil-”
Learning 'From Nobody': The Limited Role of Teaching in Folk Models of Children's Development (2010, unknown): “After all, the ‘child’s will is his motive force’ (Gray 2009, 507).”