Open-ended play with blocks and simple materials Although children’s play just happens spontaneously, it is complex and comes in myriad forms. One universal type is open-ended play, also known as free-flow play, in which the children themselves determine what to do, how to do it, and what to use. Open-ended means not having a fixed answer; unrestricted; allowing for future change. In the course of such play, children have no fear of doing it wrong since there is no correct method or outcome; and observant adults are privileged with insights into children’s development and thinking. Open-ended play is intrinsic to childhood; children have an impetus to explore and create. When free to experiment with the simplest materials, they find ways to express and develop their thoughts in imaginative play.