Keep it simple... you know the rest

I thought I was the only one who couldn't figure out in a pinch which button opens the elevator doors, but I've observed a few people with the same level of indecision. I think I'm fairly smart and yet when someone comes running for the elevator at work there is always a hesitation trying to figure out which button to push. The issue being that the symbols aren't obvious when you are trying to make a quick decision.

The point? Can't it just say "Open" or "Close" under the buttons? Just make it simple. That's exactly the way your marketing message should be. Want someone to buy your tires. Tell them why you have great tires. Want someone to donate money to your cause? Tell them where their money goes. Keep it simple.