Button, Button, Which One Is the Button?

Here's a great example of a bad user interface:


See how the G and 1 are bright white, while the 3, 4, and 5 are kind of faded looking?


The paint is worn off because all of the people who are new to the elevators (located in a hospital) think the black circle with the number is the button. Which I have to say seems like a reasonable assumption.

Folks eventually figure it out and press the silver circle instead, and when they return to the lower floors, they press the silver button instead of the black G and 1, hence the bright white paint on those.

I guess no one goes to the second floor. Must be where the offices are.