This study clarifies the extent of children's living space and the development of cognizance. As the children grow up, though the number of play lots is almost same, utilization of play lots increases. In the fourth and sixth grade, the children living near the school tend to cognize regions in the euclidean space, while the children living far from the school tend to cognize regions in the topolpgical space. Thus it is important to locate a school within a certain distance from children's home, from a point of view of the development of cognizance.
