A Tower of Wooden Coasters

I climbed down from the windowsill and scampered over to the small round side table where nobody was looking. Resting beside a tall ceramic mug was a neat stack of square wooden drink coasters with cork bottoms. Instead of just hiding behind them, I wanted to... well, build something. My plush mittens gripped the rough cork edge of the top coaster, wobbling as I leaned it upright against another to form a tiny peaked roof. It teetered, swayed, and almost collapsed, but when I braced a third square flat beneath them like a foundation, it held! Sitting back on my heels, I admired my little solid triangular tent.