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When researching construction, you invariably discover that any new or innovative idea has actually been tried over and over again, often stretching back decades. One of these new-but-actually-old ideas is the idea of a mechanical bricklayer, a machine to automate the construction of masonry walls.
It’s easy to see the appeal of this idea - masonry construction seems almost perfectly suited for mechanization [0]. It’s extremely repetitive - constructing a masonry building requires setting tens or hundreds of thousands of bricks or blocks, each one (nearly) identical, each one set in the same way. It doesn’t seem like it would require physically complex movements - each brick gets a layer of mortar applied, and is simply laid in place next to the previous one. And because each brick and mortar joint is the same size, placement is almost deterministic - each brick is the same fixed distance from the previous one.