You’d think the world had run out of challenges for LEGO builders. After all, we’ve seen ‘functional’ lawnmowers, instant-photo Polaroid cameras that spit out LEGO “photos,” and even a ‘working’ rotary phone, all meticulously engineered, all somehow feeling like they’re right at home in the pantheon of LEGO absurdity. Yet, every so often, a builder comes along who ups the ante and rewrites the rules of what counts as “functional.” This time, that crown goes to a...