Exploring the Recycled Materials
Empty the clean, dry contents of the junk store onto the floor and sift through with your child, comparing texture, shape, size and colour.
How thick/thin, hard/soft, bendy/rigid, rough/smooth opaque/transparent are the recyclable materials?
Your child enjoys the process of inspecting the materials with you; perhaps she could separate and sort them into piles according to certain attributes.
Continue to explore junk on other occasions, giving her the opportunity to work out how individual pieces would fit together to produce the constructions she aspires to build.