Traditional masonry, but instead of subtractively carving precision stone shapes from larger units of source material they create custom shapes in an additive process. Given the reactions here I'm not sure that a "bright to nowhere" was a good idea as a demonstration project, but I guess their target audience are architecture professionals who will easily see the process begins the demo.

I wonder how much of the recycled material really is concrete: the writing seems to carefully tread around any specifics, trying to distract with absolute quantities. Could it be that this "concrete ink" is basically a composite of recycled plastic and ground concrete? I'd imagine that this could achieve limestone-like performance while pretend-solving disposal.