A Curious Roll

I noticed a faint shadow stretching beside a stack of heavy books. What might be resting in that narrow gap? I stepped forward quietly, keeping my little broom held steady. Peering into the dim space, I discovered a dry brown acorn tucked against the baseboard. With a gentle, measured nudge from the end of my broom, I touched its rough shell. It rolled! A tiny hollow sound echoed across the floorboards. It stopped right before my toes, perfectly smooth and still.