A Curious Domino Track

I noticed four smooth wooden dominoes resting in a tiny stack near the hall doorway! Wouldn't it be delightful to see if they could share a rhythm together? I pushed the top block loose with both paws, then carefully nudged each rectangular tile upright onto its short end across the polished floorboards. Line them up, just one toe-length apart! When the last one stood tall and steady, I gave the first domino a gentle, polite tap with my green shoe. Click-clack-clatter! They toppled forward in a cheerful wave, landing flat in a neat staircase pattern.