I needed a nice way to initially block off parts of Virtue's Heaven's second and today I asked myself "what if progress is gated by a big pair of calipers that measure your head and then tell you that you're not human enough to gain entry?" and of course I immediately went to work.
I really like this idea, because not only does it fit the theme of the area and the game in general, but I also got to use my Anthropology degree again! Pretty sure I wouldn't have gotten to this idea, if I hadn't very early in this game's development decided to never lock progress behind movement upgrades.