20thcentury architecture children children'sstudies childrenandtheenvironment contemporary(1945-) creativeabilityinchildren design earlychildhoodeducation edu000000edu010000edu023000 education elementary general his036060arc005080soc047000 history humanfactors kindergarten outdooreducation outdoorrecreationforchildren place-basededucation preschool socialconditions socialscience unitedstates