A Boxy Tower

A fresh cardboard tissue box was sitting square in the middle of the low wooden coffee table, and I couldn't resist stacking things. I grabbed an empty ceramic mug by its ear and hoisted it right onto the cardboard lid. Whoa! It wobbled on the flimsy slit, so I quickly nudged a wooden coaster under one side to level it out. When the coaster slid into place, the mug settled with a solid clink. I took two steps back on the polished floor, puffed out my chest, and threw both arms up in triumph!