Cardboard from house recycling, and rolls of Scotch Tape, have been important supplies these past few months. So much, in fact, that now we shop for tape at Costco, and store most boxes for future use.
The other day, when I was about to use a box for old kitchen storage, my youngest daughter claimed the box and inspected it closely. The next morning, that box was a castle. There was also a throne, a scepter, and a several trophies. A central ingredient is having a cupboard dedicated to art supplies. Note the pink "shoe" tape. Everything stops when we can't find the shoe tape.