I’ve found three, but surely there’s got to be more hidden in the city somewhere.
Challenge accepted.
Cool challenge. Will keep my eyes peeled… 
And fingers typing, considering how good you are at the pic quiz.
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Looks like Ximen Exit 6. Wonder if it’s permanent or painted for an event. Haven’t been there in a while.
That’s permanent, well at least until it fades
It has probably faded in this nonstop rain.