In 2016, bricklayers in Teralba, NSW Australia filmed their domino-style technique for capping a concrete brick wall. The video went viral thanks to the surprising second part of the chain reaction: After the bricks fell like dominoes in one direction, they quickly fell like dominoes again in reverse.

How and why did that happen? Mathematician Matt Parker shows us what’s going on in The Brick Double-Domino Effect Explained.

Plus, watch the bricks fall perfectly both ways in the original vid:

Try it yourself and let us know how it goes.

Next: Watch more domino videos and more videos about math, including Parker’s Measuring the Berlin TV Tower with a ruler.

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