Tokyo hosts plenty of pint-size public sculptures, but none so "wee" as the brazen boy standing on the platform between lines 3 and 4 at Hamamatsucho Station in Minato Ward. Just back from a trip to Brussels, I am stunned to glimpse there a bronze replica of the Belgian capital's most cheeky landmark, the Mannekin Pis (Peeing Boy). I hop off the Yamanote Line train to investigate.