I have been busy recently educating myself on Schemas.
Schemas are patterns of repeated behaviour that children display through playing. They allow children to explore and express developing ideas and thoughts through their play and exploration.
My son (aged 21 months) is currently displaying clear signs of an enveloping/enclosing schema, he loves to fill bags with things he has found and loves getting into boxes.
The CBBC website has a great piece which explains all about schemas –