Build a spectacular marble run, of course!
We’ve made a zillion, but Mookie has never really done the building, much less the designing. She asked how you do it, and I suggested picking one from the Quadrilla booklet and following the step-by-step instructions. Naturally, she created one from scratch herself instead, and did pretty well figuring out how to engineer it so the marbles would go in the direction she wanted.
Hers is the tower with the big spiral on top, in the foreground in the first photo. We built two separately and then bridged them.
Now she is enacting an elaborate drama with the royal family, a special subset of marbles with unusual colors.
The caste system: royalty, workers (with their two leaders), and soldiers (with their five leaders). Hmmm.