A Sharp Clack

I tapped the narrow corner of a black wooden domino standing upright near the edge. It tipped forward with a sudden, crisp clack and slapped flat against the table! I paused, instantly flattening my belly against the warm walnut wood... Did it get startled, or was it trying to surprise me? When the quiet settled back in, I took two cautious steps forward. Its painted white dots were staring straight up at the ceiling like tiny curious eyes. Very slowly, I rested one front paw across its smooth, painted back. Did it fall over just to see how still I could freeze?