Speed Wall

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How to Build the Trick:
Here is an example of how to make it by midobo.

Starting the Trick:
You can start the trick with a regular domino line.

Ending the Trick:
You can put a domino line at the end of the speed wall. Make sure that the first couple dominoes are aligned to the speed wall.

Options:
You can make it into more of a rectangle shape by placing an additional face down domino onto the outside flat dominoes and stacking two dominoes on top of each other as explained by Hevesh5 in this video.

You can also make domino speed wall cross into each other as explained by Hevesh 5 in this video.

Examples:
Here is a video of a really long speedwall.