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Mark Rober had a nice video on this robot. To me, the coolest part was the 'refill station' they built to load dominoes into the robot.

https://www.youtube.com/watch?v=8HEfIJlcFbs

One critique on the design is that it only does big boring fields of parallel domino reactions; it can do pixel-based art, but no curving or other patterns that even a child domino stacker uses. There's room for domino robot innovation!