The paper compares the role play of preschool children from 3 to 7 years with two different types of play material: play clothes and open-ended materials. The role is understood as a three-part process, including renaming, changing the appearance and playing actions. It is shown that role substitution depends on the object environment: children of the same age play differently in two different object environments. Children 3-5 years demonstrate more integral play in open-ended environment. They call themselves a role-name and their actions and changing the appearance often support it. In comparison children of this age often rename themselves, but rarely realize a new name in play actions in environment with play clothes. Role substitution ...