The contents of the `Terminal` subdirectory, as well as `NSObject+SLVisibility`, are of primary importance to the framework itself, but might be useful to clients with advanced uses, so they're public, just not included in `Subliminal.h`--they've got to be imported directly. (They're headers like `<UIKit/UIGestureRecognizerSubclass.h>`, in other words). I haven't been able to think of a good way to call this out in the folder structure (or the documentation, admittedly).