Perplexing Placard

elevator signThis sign, which I came across this morning in the elevator of a new building in Bangkok, really made me stop and think.

The fact that I was still in a sleep-deprived, semi-conscious haze resulting from an overnight bus ride from Phuket to Bangkok (during which I sat behind a woman who snored like a mountain gorilla) meant that it took me a few moments to figure out which button corresponded to which floor level.

You gotta wonder why the elevator buttons don't simply reflect the actual floor levels, which would obviate the need for this complicated instructional diagram to confuse assist you in navigating the intricacies of elevator operation.

I'm sure there's a perfectly reasonable explanation (?).