A Lego Playground

My daughter has been building a playground. She is quite adept at Duplo Legos (bigger Legos made for smaller hands). She makes planes, boats, hotels, and trains with her Duplos. Last week she even made a "Costco" "full of all the things" (a pretty good description of Costco). 

She is not yet, however, very skilled at putting together and taking apart regular size Legos and she really really wants to build with them. So she has become "foreman of the playground" and her dad and I are the construction workers. She directs, "we need a slide" and she finds the pieces and dad puts them together. She states, "We need a swing" and mom figures out a way to make the swing move. When she discovered that the Duplo figures couldn't sit in the swing (but Lego mini-figs could), she declared "That swing is for babies. We need a big swing" -- one for duplo-sized people." And then "Nana needs a bench to sit on." There's no kit, no directions on what we should build, or picture on the box to limit her ideas. Whatever she imagines, we collectively figure out a way to create. This collaborative project has lasted for days and she wants to leave other activities (like the zoo!) to go home and play with her playground.