Some call it the latest art trend, but others lambaste it as an ugly symbol of present-day Japanese society.

People visiting Tokyo's Shibuya Ward are invariably surprised at the ubiquitous presence of graffiti, which fills every conceivable space ranging from the sides of public baths to traffic signs to roadside walls.

For street painters operating in this mecca for the hip young, it matters not whether their canvas is a kindergarten or personal property.