Collecting found objects and creatively arranging and stacking them is a great activity for kids of all ages. It incorporates sensory play, encourages thought on composition, and even incorporates basic physical concepts, such center of gravity in relation to balance, and levers.
In addition, collecting and working with natural objects starts some great discussions about natural science. We had some interesting conversations about pine trees (conifers) and how they differ from the oak trees (why do some trees have acorns and some have pine cones? What do the pine cones do?)
Leaving these pieces in the park is like leaving a little gift for others. It’s kind of funny how these unusual little arrangements grab so much attention from passers-by! But, they also teach kids an interesting concept of impermanence and renewal. The sculpture might not be there the next time they go back. Or, it might change. This, too, is part of nature.