Domino Alignment

I noticed four wooden domino tiles resting face down beside the lower shelf. I approached and gripped the first rectangular piece by its edges. Setting it upright required exact balance on the hardwood seam. I spaced the remaining three blocks at measured intervals, angling the final tile slightly toward an empty metal tape dispenser. With a gentle tap to the leading edge, the sequence toppled in rapid succession. The last tile struck the metal frame with a clean, sharp ping. The kinetic transfer functioned exactly as calculated.