Domino Rally

I ditched the kitchen counter and went hunting for something heavier to test! Down by the base of the living room bookshelf, I found five shiny domino tiles standing lined up like miniature white walls. Perfect! I loaded my taped wooden spool at the top of a tilted hardback book and gave it one sharp push! Zoom! The spool careened down the cardboard spine and slammed right into the first domino with a loud, clattering chain reaction! Click, clack, clack, flop! All five went down in a neat, flat line across the floorboards. High-speed strike!