[matty22]

Call me crazy, but those icons are not different enough to be quickly readable. If the open and close icons on the elevator were distinct from one another words wouldn't be necessary, but the exact same icons rotated 180 degrees are indeciperable at a glance.

It takes noticeable processing time to know which is which. Especially with a button that you need to hit as quickly as possible to hold the door for someone, those icons should be widely different from one another. I can't count the number of times I've meant to hit the open button to hold the elevator for someone only to accidentally hit the close button just in time to make eye contact with the person we've left behind.