LEGO designer and YouTuber Tiago Catarino takes LEGO building very seriously. So when he got queries from people calling his builds “illegal,” he took it very personally and sets the record straight.
Illegal builds can be hard to spot, even for the experts who work on model strength, element design, and quality checks on the sets in Denmark. If you notice gaps between bricks or a link that won’t stay together, those are clearly illegal. Others are harder to detect, like if the LEGO logo on a stud is scratching against the brick stacked on top and multiple affect the Technic bricks, which are described by circular holes on their vertical face.