tools made of natural material. The teachers and instructors only observe and document the children's independent play. The method was created by Cheng Xueqin and is organized in two hours of free play when the children choose the available material they want to use and build structures to play. While planning, experimenting, building and using the structures to play, the children have the opportunity to interact with peers, to think critically about what may work, to discuss the plan and organize the construction hard work. The process is observed and recorded by the teachers and instructors without intervention, even in instances of possible risk. Before and after the two hours of play, the children have the opportunity to express their plans and discuss with their peers. After the play, they get the opportunity to draw, write or explain what they did. Then, they watch the videos recorded the same day and explain how they played and comment on each other's creations. Anji play is also called "true play" and its guiding principles are love, risk, joy, engagement, and reflection. This method of self-initiated and self-directed play is applied at the pre-schools (to children from 3 to 6 years-old) in Anji county, East China. References Further reading Caillois, R. (2001). Man, play, and games. Urbana and Chicago, University of Illinois Press (originally published in 1958; translated from the French by Meyer Barash). Encyclopedia: Play Science Scholarpedia Huizinga, J. (1955). Homo ludens; a study of the play-element in culture. Boston: Beacon Press. Jenkinson, Sally (2001). The Genius of Play. Hawthorn Press Sutton-Smith, B. (1997). The ambiguity of play. Cambridge: Harvard University Press. Burghardt, Gordon M. The Genesis of Animal Play: Testing the Limits Wenner, M. (2009). "The Serious Need for Play" – Free, imaginative play is crucial for normal social, emotional and cognitive development. It makes us better adjusted, smarter and less stressed, Scientific American. Gray, P. (2013). Free to Learn: Why Unleashing the Instinct to Play Will Make Our Children Happier, More Self-Reliant, and Better Students for Life Gray, P. (2008–2009). "Social Play and the Genesis of Democracy", "The Value of Play I: The Definition of Play Provides Clues to Its Purposes", "The Value of Play II: How Play Promotes Reasoning in Children and Adults", "The Value of Play III: Children Use Play to Confront, not Avoid, Life's Challenges and Even Life's Horrors", "The Value of Play IV: Play is Nature's