Dominoes make sense for a playful building project: They require both a sense of imagination and careful attention to each individual piece. One quiver of the wrong block and the entire thing could come crumbling down. has the attentive hands needed to not just set up dominos, but to get a machine to set them up for him.
This isn't the first time Wandel has figured out how to get his dominoes just right, he's also done so with . But this project introduced a whole new level of difficulty. While the magazine and slider work on the first go-around, Wandel had to build out a straightener for the pieces and alter the speeds. With Legos this requires adding and subtracting pieces, with wood it requires power tools.
Freestanding domino structures are notoriously difficult to build, perhaps if Wandel builds a vertically climbing version of his machine he could set a new record.