All the confusing doors they show are "Norman Doors": > A so-called “Norman Door” has design elements that give you the wrong usability signals to the point th

All the confusing doors they show are "Norman Doors": > A so-called “Norman Door” has design elements that give you the wrong usability signals to the point that special signage is needed to clarify how they work. Without signs, a user is left guessing about whether to push or pull, creating needless frustration. (from the 99% Invisible page)