One huge part of graffiti that is largely ignored by the general public is the idea of "getting up". Tags, both large and small, are a vital part of gaining notoriety as a graffiti artist. One of the most innovative ways that writers get up is the fire extinguisher method. Using a re-purposed fire extinguisher, writers can tag massive swaths of wall in no time at all. The Katsu tag below from the Seattle Street Art Biennale (more photos Here) is the perfect example of a well done, distinguished fire extinguisher.