Here is the scenario: You've got to pee. Bad. You're in a public restroom and all of the doors are shut; now do you stoop to the level of looking for feet under the cubicles to find a vacant one?
The 35-Degrees Stall Door would make life a great deal more comfortable -- and dignified -- in this sort of situation. It's an adaptation to the knob, latch and locking systems that you see in many communal washrooms, offering a fool-proof setup to keep you from waiting unnecessarily or walking in on a poor pants-less person. The handle of Donghwi Chang's 35-Degrees Stall Door angles out at 35° when there's nobody inside the cubicle to pull it shut. A lit-up red arrow assures you that the toilet is available for use.