The “Norman door” dilemma can be seen in the design of many other everyday items, and even more so in the design of software and website interactions.
—Brent Manke, “Norman doors and designing for humans,” Brent Manke, October 23, 2015
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.
—“Norman Doors: Don’t Know Whether to Push or Pull? Blame Design,” 99% Invisible, February 26, 2016