I worked on the submodule responsible for Proprioception, which is, I think, a beautiful word—pro-pri-o-cep-tion!—and also the process by which organisms judge the position of their own body parts in space. It’s a crucial sense; definitely more important than a few of the Big Five. When you walk, you look forward, not down at your feet, because you are confident they are where you expect them to be, obeying your commands. That’s a pretty cool feature.