One of my favourite things about Beijing airport are the smiling apples that sit on the security check desks in the domestic terminal:
I asked an officer why they were there and she replied "For the smile". Of course. I don't know why this need 'for a smile' came about but I'm guessing that the brief was to make an official area seem less formal and more welcoming. If I'd had that brief I'm not sure my answer would have involved drawing smiling faces on apples, but that's my lack of imagination for you.