is the do not disturb technology
most places have little door handle signs. those arent any good
some have do not disturb on one side and hey please come in on the other
those are the worst. sometimes you accidentally are showing the wrong side. or jokestersll flip em
the best technology involves the sign being part of the door. like a slider. or a lock.
like maybe if you put the deadlock on the door a little sign is revealed saying dont disturb
cuz maybe you have the deadlock on cuz you were on a party bus all night
and daylight savings has suddenly become your frienemy.