The Stacking Test

I pushed past the rug and found two thick, heavy paperbacks sitting on the floor. Flat tops. Firm edges. Perfect. I set my front hooves onto the first spine—creak! It wobbled just a fraction. I didn't back down. I leaned my weight forward, stubborn and steady, until both hind hooves clicked into place beside them. From up here, I spotted tiny golden numbers stamped along the spine below: '0-7432'. A fine code. A very worthy perch.