A large structure comes into view on the left as you cross over the Konohana Bridge from Hokko, Osaka's North Port. There you see a golden onion atop a towering smokestack and colorful red and yellow walls. What is this place that looks as if it came straight out a children's picture book? Is it a castle in an amusement park? Or a fortress in a fantasyland? No, the building, known as the Maishima Plant and the pride of the City of Osaka, is a waste incineration plant.