Investigating shadows. "Young children ask many questions to make sense of the world and their place in it. Their curiosity and natural sense of wonder drive them to explore and investigate the answers to their questions." Lisa Daly and Miriam Beloglovsky - Loose Parts: Inspiring Play in Young Children.
"Symbolic play allows children to fit the reality of the world into their own interest and knowledge. Loose parts are great materials to support each stage of symbolic play." Loose Parts: Inspiring Play in Young Children