Imagine you have 12 juice-size cups in front of you. Carefully construct a six-cup pyramid in the middle and two three-cup stacks either side. Then, working from right to left, demolish these structures finishing with three perfect cup stacks, and punch the clock.

You just mentally completed what stackers call a 3-6-3. How long did it take? A minute? Thirty seconds . . . 2.6 seconds? Odds are, even in your head, you can’t do it fast enough to beat some of the Island kids who have taken up the sport over the past year.