On 29/09/10 00:04, Richard J. wrote:

Oh, I see! I thought the splodges of colour were national flags or
something; didn't realise they were letters.

Of course, that does invite the question: "why does the lettering say
'SMILE'?"

Perhaps it says 'SMILE' because this is the SMILE subway -- if so, we're
no closer to knowing why it's so called than before...

-roy