Internationallyknowngraffitiartist,Banksy,lefthismarkonSanFranciscoinApril2010.Littledidheknowthatthisactofvandalismwouldsparkachainofeventsthatincludesoneofhisratsbeingremovedfromawall,MuseumsignorantlyturningdownafreeBanksystreetwork,andaNYgalleristwhohasmadeithisbusinessmodeltoremoveBanksystreetworksfromallovertheglobedoingwhateverittakestogettheratinhispossession.