… isn’t as silly as it first appears, I think.
With today’s technology you could certainly build an elevator that’s called automatically when you stand in front of it. (I bet somebody has, probably in Japan.) Doors that open when you walk in front of them are commonplace nowadays. They’re annoying when they startle you as you walk past them on your way to somewhere else, but they’re a godsend when you’re leaving a store with an armload of packages — not to mention for people with mobility problems.
Why do we not have easier ways to call an elevator?
Phil’s Blog 