I was reading about Glastonbury toilets, where last century people used to throw themselves into latrines, probably with embarrassment at crapping with no door. Apparently some folk even died of shame on the pan. Nowadays Glastonbury has hermetic robotic toilets. Everything balances up over time.
In Jockland recently I went in a train bog with a sliding star trek door that swished closed behind me. While seated, I thought I'd double check that the door really was locked. On pushing the red "Close" button, I was surprised when the door whizzed open again, giving a panoramic view of half the carriage. Those train designers should attend Albert's classes on user interface design.