system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 why do lego figurines have a black mark on the front of their "neck"?
gpt
It allows for the machines assembling the minifigure to know which way the torso is facing, so it prints on the correct side. Arms are attached after the torso is painted, so there's no way to tell which side is the front or back without that black mark.