Abstract
This study explored the nature and the characteristics of the preschool children's peer play from the viewpoint of the Vygotsky's play theory. The emergent process of preschool children's collaborative pretend play on the theme of a hospital was investigated for a month. The children's process of constructing play space for pretend play by using play materials such as blocks was also explored through micro-genetic analysis.Children gradually began to enact proper make-believe activities and role-play scenarios related to the hospital. The Discussion focused on the interdependency between children's play activity and the process of their construction of play space.
